The New Covenant in Christ: Where the Promise Becomes Blood, Bread, and a Cup

Luke 22:14–20 and Hebrews 8–10 — the night Jeremiah's prophecy was ratified, and the centuries-old sacrificial system finished its work

5.1 — The Upper Room: A Promise Becomes a Cup

The Upper Room is not a generic meal. It is a Passover. That detail matters more than almost any other in this module. Every adult Jew in the room is observing the festival Moses commanded their fathers to observe forever (Exodus 12) — the meal that retold, every year, how God had rescued their ancestors out of Egypt by the blood of a lamb on the doorpost. The liturgy of the meal was fixed. The four cups, the bread, the bitter herbs, the recitation of the Exodus story — all of it followed a familiar pattern that every man in the room had grown up reciting.

And in the middle of that familiar liturgy, Jesus does something none of them are expecting. He takes a piece of unleavened bread — the kind that has been on Passover tables for fifteen centuries — and He breaks it. That is normal. Then He says something that is not normal: “This is My body, which is given for you; do this in remembrance of Me” (Luke 22:19). The Passover meal had a script. The script does not include those words. They land on the disciples like a hand grenade rolled across the table. The bread of your body? Your body given? Remembrance of You?

Then He takes a cup. There are four ritual cups in a traditional Passover seder. Most scholars think the cup Jesus lifts at this point is the third cup — the cup of redemption, taken after the meal, which retells the Exodus 6:6 promise “I will redeem you with an outstretched arm and with great judgments.” Whatever cup it is, the timing is deliberate. And Jesus' words over the cup are the most consequential single sentence in this module:

“This cup which is poured out for you is the new covenant in My blood” (Luke 22:20).

Every word does theological work. New covenant — He is quoting Jeremiah 31:31 directly. The phrase berit chadashah shows up exactly once in the Old Testament, in that prophecy, and Jesus is picking it up six centuries later in the only setting where the phrase could make sense — a covenantal ratification meal. In My blood — He is announcing that the ratification of this covenant requires a death, and the death will be His own. Poured out for you — the language of sacrifice. Blood was “poured out” at the base of the altar in the Levitical system (Leviticus 4:7, 18, 25). Jesus is using that exact vocabulary about Himself.

Whether the disciples understood it in the moment is another question. Luke says nothing about how they reacted. The synoptics generally treat the disciples as slow to grasp what Jesus is doing right up until after the resurrection. But the words themselves are precise. Jesus is announcing — in advance, in language drawn from Jeremiah and Exodus — that the covenant Israel had been waiting six hundred years to see ratified is being ratified that night, and that He is both the priest who ratifies it and the sacrifice whose blood makes it valid.

5.2 — “This Is My Blood of the Covenant”

Matthew's version of the Upper Room words is slightly different from Luke's and carries a clue Luke leaves implicit. Matthew 26:28: “This is My blood of the covenant, which is poured out for many for forgiveness of sins.” The phrase blood of the covenant is not a generic phrase. It is a direct quotation. Read what Moses said fourteen centuries earlier when he ratified the Sinai covenant.

Moses sprinkled the blood of bulls on the people and declared, “Behold the blood of the covenant, which the LORD has made with you in accordance with all these words” (Exodus 24:8). That is the founding scene of the Mosaic covenant — the ratification ceremony. Blood from a sacrificial animal, sprinkled by the mediator on the people, sealing the covenant the people had just agreed to keep.

Jesus, on the night before His death, picks up that exact phrase. This is My blood of the covenant. Every Jewish man in the room is hearing the echo. Moses sprinkled the blood of bulls. Jesus is announcing His own. The mediator at Sinai used the blood of an external sacrifice. The mediator at the Upper Room is the sacrifice. The covenant being ratified is not a renewal of the Mosaic. It is the new covenant Jeremiah promised, ratified in a way Sinai foreshadowed but never accomplished.

There is a phrase in Leviticus 17:11 that hovers behind all of this. “The life of the flesh is in the blood, and I have given it to you on the altar to make atonement for your souls; for it is the blood by reason of the life that makes atonement.” Hebrews 9:22 picks up the same point: “Without shedding of blood there is no forgiveness.” Throughout the Old Testament, every covenant of significance involved blood. Noah's covenant followed the post-flood altar. Abraham's covenant involved animals cut in two. Sinai involved bulls. The pattern is consistent: a covenant requires a death. Something dies so that the covenant can stand.

The New Covenant inherits that pattern but transforms it. The death required is no longer the death of an external animal substituting for the people. The death required is the death of the covenant Mediator Himself, given freely, in the place of the people. The blood Moses sprinkled was a foreshadow. The blood Jesus poured out is the reality. And after that reality, no further blood is needed — which is exactly the argument Hebrews is about to make in chapters 9 and 10.

5.3 — Hebrews on the Sufficiency of One Sacrifice

No book in the New Testament works through the implications of the New Covenant more carefully than Hebrews. The writer is addressing Jewish believers who are tempted to drift back into the synagogue system — the familiar rhythms of temple, priesthood, sacrifice — because the new arrangement looks so much more bare in comparison. He spends three chapters (8, 9, 10) building one extended argument: the new arrangement is not less than the old; it is what the old was always pointing toward, and the old has reached its purpose and is being retired.

The argument has a structure. Each piece of the Levitical system is shown to be a shadow of a greater reality now present in Christ.

A better priesthood. The Levitical priests came from the tribe of Levi, served until they died, and could not save themselves from their own sin. Christ is a priest forever in the order of Melchizedek (Hebrews 7), eternal, sinless, able to save completely. The priesthood that mediated the old covenant has been replaced by a priest who never needs replacement.

A better sanctuary. The tabernacle Moses built was patterned after a heavenly one (Hebrews 8:5, citing Exodus 25:40). Christ has entered “not a holy place made with hands... but heaven itself, now to appear in the presence of God for us” (Hebrews 9:24). The earthly sanctuary was a copy; the heavenly is the original. The veil that separated worshippers from the Holy of Holies has been torn (Matthew 27:51) because the way into the true sanctuary is now open in Christ.

A better sacrifice. This is the heart of the argument. The Levitical sacrifices had to be repeated daily, weekly, yearly, century after century, because none of them actually removed sin. They were reminders of sin (Hebrews 10:3), not the removal of it. “It is impossible for the blood of bulls and goats to take away sins” (Hebrews 10:4). The whole system was provisional — a temporary covering that pointed forward to the One who could actually take sin away.

Christ offered Himself once. Not once a year. Not once a day. Once. And that one offering accomplished what fourteen centuries of animal sacrifices could not. The writer of Hebrews uses the Greek word hapax (“once”) and ephapax (“once for all”) repeatedly — Hebrews 7:27, 9:12, 9:26, 9:28, 10:10. The repetition is intentional. The point is the finality.

A better covenant. And here Hebrews quotes Jeremiah 31 in full. Twice. Once in Hebrews 8:8–12, and again in Hebrews 10:16–17. The longest single Old Testament quotation in the entire New Testament is Jeremiah 31:31–34, and it is cited twice, by the same writer, in the same letter, as the foundation of his whole argument. Hebrews 8:13 says it plainly: “When He said, ‘A new covenant,’ He has made the first obsolete. But whatever is becoming obsolete and growing old is ready to disappear.”

The argument is not anti-Jewish, and the writer is not dismissive of the Mosaic system. Throughout Hebrews, the old arrangement is treated with reverence — it was God's idea, it was holy, it served its purpose. But its purpose was to point forward to something greater, and now that the something greater has arrived, the foreshadow is no longer needed. The animal sacrifices stop because their fulfillment has come. The Levitical priesthood is set aside because the eternal Priest has been seated at the right hand of God. The earthly sanctuary becomes obsolete because the heavenly one is now open. The covenant of Sinai is superseded because the covenant Jeremiah prophesied has been ratified.

5.4 — Four Greek Words That Carry the New Covenant Vocabulary

Modules 1 through 4 leaned on Hebrew. Module 5 has to switch languages, because the New Covenant vocabulary in the New Testament is Greek. Four words do most of the theological work.

New covenant — kainē diathēkē

The Greek phrase the New Testament uses for “new covenant” is kainē diathēkē. The second word — diathēkē, Strong's G1242 — is the Greek word the Septuagint (the Greek translation of the Old Testament) used to translate the Hebrew berit. So when the New Testament writers say diathēkē, they are deliberately using the word their Greek Old Testament used for “covenant.” The continuity of vocabulary across Hebrew and Greek matters.

Diathēkē in classical Greek normally meant “will” or “testament” — the legal instrument by which a person disposes of property at death. Hebrews 9:16–17 plays on that double meaning: “Where a covenant is, there must of necessity be the death of the one who made it. For a covenant is valid only when men are dead.” The Hebrew/Greek dual sense is theologically rich. A berit/diathēkē is both a covenant (the Hebrew sense) and a testament (the Greek sense). It both binds parties to each other (Hebrew) and dispenses inheritance through death (Greek). The New Covenant is both — and it required the death of the Testator to become operational.

The first word — kainē, the feminine form of kainos, Strong's G2537 — means “new” in a particular sense. Greek has two words for “new.” Neos means new in time — recently produced. Kainos means new in kind — qualitatively different, fresh in character, not merely chronologically new but innovatively new. The New Testament chooses kainos. The new covenant is not a recent edition of the same arrangement. It is a different kind of arrangement.

Blood — haima

The Greek word for blood — haima, Strong's G129 — appears about a hundred times in the New Testament, and a remarkable proportion of those occurrences appear in covenant contexts. Hebrews alone uses it twenty-two times in chapters 9 and 10. The vocabulary tells you what the New Testament writers think happened on the cross. They do not describe it primarily in psychological terms (Jesus felt love), or political terms (Jesus opposed power), or moral terms (Jesus modeled virtue). They describe it in sacrificial terms (Jesus' blood was shed for sin).

Acts 20:28 calls the Church “the church of God which He purchased with His own blood.” Ephesians 1:7: “In Him we have redemption through His blood.” Colossians 1:20: “having made peace through the blood of His cross.” 1 Peter 1:18–19: “not with perishable things like silver or gold... but with precious blood, as of a lamb unblemished and spotless, the blood of Christ.” Revelation 5:9: “You were slain, and purchased for God with Your blood men from every tribe and tongue and people and nation.” The New Testament writers cannot stop talking about the blood. The whole covenant turns on it.

Forgiveness — aphesis

The Greek word for forgiveness in Matthew 26:28 — “poured out for many for the forgiveness of sins” — is aphesis, Strong's G859. The root sense is “release, sending away, letting go.” It is the word used of canceling a debt, of releasing a prisoner, of sending someone away free. When the New Testament says Christ's blood brings aphesis of sins, it is not just saying sins are pardoned in the abstract. It is saying sins are released — let go, sent away, no longer hovering over the believer demanding payment.

Hebrews 9:22 uses aphesis in the famous formula: “Without shedding of blood there is no forgiveness [aphesis].” And then Hebrews 10:18 closes the argument: “Now where there is forgiveness [aphesis] of these things, there is no longer any offering for sin.” The aphesis that the New Covenant brings is so final, so complete, so genuinely a release of the sin, that no further sacrifice is required. The blood has been shed once. The release has been granted. The Levitical altar can rest.

Mediator — mesitēs

The Greek word translated “mediator” — mesitēs, Strong's G3316 — means “one who stands in the middle.” A mediator is the go-between, the one who brings two parties together. Moses was the mediator of the Sinai covenant (Galatians 3:19). The Levitical priests mediated between Israel and God daily. The New Testament names Jesus as the mesitēs of a better covenant: 1 Timothy 2:5 — “there is one God, and one mediator also between God and men, the man Christ Jesus.” Hebrews 8:6 — “He is also the mediator of a better covenant, which has been enacted on better promises.” Hebrews 9:15 and 12:24 use the same word.

What makes Christ a better mesitēs? He is both fully God and fully man — He can genuinely stand between both parties because He participates in both. He is sinless — He does not need to mediate for Himself first, the way Levitical priests did. And He does not die and need replacing — He lives forever to mediate (Hebrews 7:25). The Mosaic system needed an unbroken chain of mortal mediators. The New Covenant needs only one.

Four words. Kainē diathēkē names what kind of arrangement this is — a qualitatively new covenant-testament that required the death of the Testator. Haima names the cost of ratification — blood, given freely. Aphesis names what the blood accomplishes — release of sin, sent away, no longer demanding payment. Mesitēs names who stands between God and the believer — one Mediator who is both eternal and personal.

5.5 — The Four Promises of Jeremiah, Fulfilled in Christ

Module 4 walked through the four promises Jeremiah named in 31:33–34. This section walks back through each one and asks: how does the New Covenant in Christ actually land on each promise? The exercise is satisfying. Six centuries between prophecy and fulfillment, and every clause holds.

1. “I will put My law within them and on their heart I will write it”

Jeremiah promised internalization. Paul says in 2 Corinthians 3:3 that believers are “a letter of Christ... written not with ink but with the Spirit of the living God, not on tablets of stone but on tablets of human hearts.” The Spirit of God Himself takes up residence in the believer (1 Corinthians 6:19), and produces from the inside the fruit that the law could only command from the outside (Galatians 5:22–23). The shift Jeremiah promised — from external command to internal transformation — has happened. The believer in Christ does not obey God to earn something. The believer obeys because the Spirit has written the desire to obey into the believer's own interior.

2. “I will be their God, and they shall be My people”

Jeremiah promised relationship. The New Testament puts that promise in the strongest possible terms. “You are God's children” (Romans 8:16). “You are no longer strangers and aliens, but you are fellow citizens with the saints, and are of God's household” (Ephesians 2:19). “See how great a love the Father has bestowed on us, that we would be called children of God; and such we are” (1 John 3:1). The relational formula God spoke to Abraham and to Israel is no longer a hope deferred. It is a present identity. Believers belong to God in a way that is more permanent than the Mosaic arrangement ever managed — because the relationship is grounded not in their performance but in Christ's finished work.

3. “They will all know Me, from the least of them to the greatest of them”

Jeremiah promised universal direct access. The New Testament is emphatic that the temple veil has been torn and the way to God is now open to every believer without intermediaries (Hebrews 10:19–22). Every Christian is a priest (1 Peter 2:9). Every Christian has the Spirit and can pray directly (Romans 8:26–27). The hierarchical access that defined the Levitical system — high priest going once a year into the Holy of Holies, ordinary priests handling daily sacrifices, ordinary Israelites kept at a distance — is gone. The least and the greatest now stand in the same relational space before God, and the Spirit is the common possession of them all.

This is one of the most underappreciated theological revolutions in church history. It is also one that the Church has periodically forgotten and re-instituted hierarchies of access. The text of Jeremiah will not let us forget. All of them. Least to greatest.

4. “I will forgive their iniquity, and their sin I will remember no more”

Jeremiah promised final forgiveness. Hebrews 10:17–18 quotes that very line and immediately concludes: “Now where there is forgiveness of these things, there is no longer any offering for sin.” The believer in Christ stands in a state of forgiveness so complete that the daily sacrificial system is no longer needed. The sin that used to require ongoing covering has been once-for-all removed. Romans 8:1 says it bluntly: “There is therefore now no condemnation for those who are in Christ Jesus.” The forgiveness is not contingent on the believer maintaining a certain level of performance. It is grounded in Christ's finished work and God's deliberate choice to remember the sin no more.

Four promises. Four fulfillments. Each one held up across six centuries. Each one now operational for every person in Christ.

5.6 — The Cup We Still Drink

There is one thing Jesus did in the Upper Room that the Church has never stopped doing. He took bread, blessed it, broke it, and said “do this in remembrance of Me” (Luke 22:19). He took the cup and said the same. From the day after Pentecost forward, the early Church gathered to break bread together (Acts 2:42, 2:46, 20:7) — and that practice has continued, in some form, in nearly every Christian community for two thousand years.

Paul gives the fullest account of what the Church is doing when it observes this meal:

Notice what Paul says in verse 26: “For as often as you eat this bread and drink the cup, you proclaim the Lord's death until He comes.” The Lord's Supper is not a static memorial. It does three things at once. It looks backward to what happened in the Upper Room and on the cross. It looks forward to the return of Christ when the meal will be consummated in His kingdom (Luke 22:18). And it looks inward at the present moment — the believer is participating now, here, in the covenant that has been ratified, eating and drinking what Christ called His body and His blood.

Christian traditions have understood this practice differently for two thousand years. The text itself can be read in more than one way, and serious, godly people have landed on different views. The major positions, in brief:

Memorial views read “do this in remembrance of Me” primarily as an act of remembering — the bread and cup are signs that point to Christ's body and blood, but the elements themselves remain bread and wine. The presence of Christ in the meal is the presence He has in any gathering of His people. (This is the most common reading in Baptist, many evangelical, and Free Church traditions.)

Spiritual presence views hold that Christ is truly and spiritually present in the meal in a way He is not present apart from it — the believer feeds on Christ in the Supper, by faith, even though the bread and wine remain bread and wine. (This is the historic Reformed view, articulated by Calvin and held by most Presbyterian and Reformed traditions.)

Real presence views understand the elements to actually contain or become Christ's body and blood — either by transubstantiation (Catholic), consubstantiation (Lutheran), or sacramental union (Anglican high-church). The meal is not just a memorial but a real participation in Christ's sacrifice.

This module will not try to settle the question. What is shared across all Christian readings is the conviction that Jesus genuinely instituted this practice, that it is ongoing in the Church until His return, and that it is genuinely connected to the New Covenant ratified in His blood. Whatever else the Supper is, it is at minimum the practice the Church has used, for twenty centuries, to remember and renew the covenant in which it stands. The cup we drink is the cup of the covenant. The bread we break is the body given for us. Every time a congregation observes the meal, the New Covenant is being recalled to mind again.

5.7 — Reflection: Closing the Arc

Theme 4 has been five modules long. It started with Abram, asleep, watching God walk alone between bloody pieces of an animal in Genesis 15. It is closing with a Galilean rabbi lifting a cup in an upper room in Jerusalem and announcing that the covenant Jeremiah heard about in the dark is being ratified, that night, in His own blood. The distance between those two scenes is two thousand years of biblical history. The continuity between them is one God, one promise, one slowly unfolding plan, one Seed.

The promises do not contradict each other. The Abrahamic promised a seed that would bless the nations. That seed has been narrowed — to Isaac, to Jacob, to Judah, to David, to one descendant of David born to a teenage girl in Nazareth. The Mosaic gave the law that diagnosed the human heart and showed that the seed could not come from human goodness alone. The Davidic put the seed on a throne. The New Covenant prophesied that God Himself would solve the heart problem the previous covenants could only diagnose. And the New Covenant in Christ is the moment when all of those promises land in a single Person whose blood ratifies the whole arrangement.

The seed of Abraham. The Law-keeper of Sinai. The Son of David. The Lamb whose blood inaugurates Jeremiah's covenant. He is all four. He is the answer to all four. And He is, today, mediating the covenant He ratified — still interceding (Hebrews 7:25), still cleansing (1 John 1:9), still present at His Father's right hand on behalf of His people.