The Abrahamic Covenant: God Walks Alone

Genesis 15 — the cutting of the covenant, and the moment everything afterward depends on

1.1 — The Text in Context: Reading Genesis 15

Before working through the theology, read the chapter itself. But Genesis 15 does not start in Genesis 15. It starts three chapters earlier, with a call.

This is the promise that everything afterward unpacks. Three commitments: land (“the land which I will show you”), seed (“I will make you a great nation”), and blessing (“in you all the families of the earth will be blessed”). Abram is seventy-five years old. He is in Haran. He has no children. He is told to leave a settled life for a land that has not yet been named.

He goes. Years pass. He has been wandering the land that was promised but does not yet possess it. He has rescued his nephew Lot from a coalition of kings and refused to take a share of the spoil. He has been blessed by Melchizedek, a priest-king who appears out of nowhere and disappears just as fast. And now, somewhere in the quiet after all of that, the word of the Lord comes to him in a vision. This is where Genesis 15 begins.

Read it through once before going further. The chapter has two movements. Verses 1–6: Abram raises a concern (he has no heir), God answers with a promise (count the stars), and Abram believes. Verses 7–21: Abram raises a concern (how will he know he will possess the land), God answers with a covenant ritual — animals split in half, a deep sleep, smoke and fire passing between the pieces. Two questions. Two answers. One answered with a word, the other answered with a sign so dramatic the rest of the Bible will refer back to it.

1.2 — “He Believed God, and It Was Reckoned to Him as Righteousness”

Genesis 15:6 is one of the most important sentences in the Bible. Paul quotes it in Romans 4. He quotes it again in Galatians 3. James echoes it in James 2. The Reformation pivoted on its interpretation. And it lands in the middle of the chapter without fanfare, almost in passing.

Three things are happening in this verse. First, Abram is responding to a promise he has no power to fulfill — that his descendants will outnumber the stars, when he does not yet have one child. Second, his response is not obedience, not sacrifice, not ritual — it is belief. Third, God's response to Abram's belief is to credit something to his account. Righteousness. A righteousness Abram did not earn and did not produce.

The Hebrew verb behind “reckoned” (or “credited,” or “counted” in other translations) is chashav — Strong's H2803. It is an accounting word. To chashav something is to enter it into a ledger, to assign it a value, to treat it as belonging to a particular account. The same verb is used in Leviticus for the priest reckoning a sacrifice acceptable. It is used in 2 Samuel for David being reckoned among the mighty men. It carries the weight of a formal, deliberate act of attribution.

What God reckons to Abram is righteousness. Not future righteousness once Abram has produced it. Not partial righteousness based on Abram's track record. Righteousness, full stop. The ledger entry is made in response to one thing: Abram believed.

This is the verse Paul cannot leave alone. In Romans 4 he points out that Abram was reckoned righteous before he was circumcised — the sign of the covenant comes in Genesis 17, two chapters and (per Genesis 17:1) at least thirteen years later. So whatever circumcision is, it is not the basis of Abram's righteousness. Circumcision is the seal of a righteousness Abram already had by faith. And if Abram's righteousness came by faith before any sign was given, then the pattern of justification by faith is older than the law, older than the covenant sign, older than Israel itself. It is the original way righteousness has always been given.

1.3 — The Cutting of the Covenant: God Walks Alone

After Abram is reckoned righteous, he asks a second question. He believes God about the seed — but how can he know he will inherit the land? God's answer is not another word. It is a ritual. And the ritual is strange.

God instructs Abram to bring five animals: a three-year-old heifer, a three-year-old female goat, a three-year-old ram, a turtledove, and a young pigeon. Abram cuts the animals in two (except the birds) and lays the pieces opposite each other. Birds of prey come down on the carcasses, and Abram drives them away. As the sun sets, a deep sleep falls on Abram — the same word, tardemah, used of the sleep God put on Adam when He made Eve — and a terror, a great darkness, falls on him. God speaks to him in that darkness about a future of slavery and rescue. Then, when the sun has gone down and it is fully dark, a smoking oven and a flaming torch pass between the pieces.

The Hebrew phrase for “making” a covenant is karat berit — literally, “to cut a covenant.” The verb karat (Strong's H3772) is the same verb used for chopping down a tree or cutting off a hand. To cut a covenant is to perform a violent, irreversible act. And berit (Strong's H1285) is the covenant itself — the binding agreement, the oath, the formal commitment with its terms and its sign.

In the ancient Near East, this kind of ritual is well-documented. Two parties making a binding agreement would split animals in half and walk together between the pieces. The unstated meaning was: may it be done to me what was done to these animals if I break this covenant. The split carcasses were a self-curse. To walk between them was to put your own life on the line.

What is astonishing about Genesis 15 is that Abram does not walk between the pieces. He is asleep. He is in deep darkness. He is a spectator, not a participant. The smoking oven and the flaming torch — the two visible manifestations of God's presence — pass between the pieces alone.

The two visible forms of God's presence — smoke and fire — are not random. They will appear again. A pillar of cloud and a pillar of fire will lead Israel out of Egypt. Smoke and fire will descend on Sinai when the law is given. The cloud of glory will fill the tabernacle and later the temple. The same God who passed between the pieces alone in Genesis 15 keeps showing up in smoke and fire throughout the rest of the story. The covenant He cut here is the covenant He is still keeping.

1.4 — The Three Promises: Land, Seed, Blessing

The Abrahamic covenant is not one promise but three, woven together. Each one starts in Genesis 12, gets reaffirmed in Genesis 15, gets sealed in Genesis 17, and gets pursued through the rest of the Bible. Each one reaches forward toward Christ.

Land

“To your descendants I have given this land, from the river of Egypt as far as the great river, the river Euphrates” (Genesis 15:18). This is not a vague spiritual territory. It is geography. The covenant specifies borders. Israel will spend the next several books of the Bible moving toward this land, conquering it under Joshua, losing it under the kings, going into exile, and being brought back. The promise of the land is one of the threads that holds the whole Old Testament together. And the New Testament does not spiritualize it away — Romans 11 still insists that God has not finished with the physical descendants of Abraham, and the prophets describe a future restoration to the actual land. The kingdom that Christ will inherit is centered on Jerusalem, in the territory promised to Abraham.

Seed

“Look toward the heavens, and count the stars, if you are able to count them... So shall your descendants be” (Genesis 15:5). The Hebrew word for seed is zera — Strong's H2233. It is a collective noun — like the English word “offspring” — that can mean many descendants or a single descendant, depending on context. Paul makes a remarkable argument from this in Galatians 3:16: “Now the promises were spoken to Abraham and to his seed. He does not say, 'And to seeds,' as referring to many, but rather to one, 'And to your seed,' that is, Christ.”

Paul is reading Genesis carefully. The promise has both a corporate fulfillment (a multitude of descendants — Israel) and a singular fulfillment (one specific descendant — Christ). The whole nation comes into existence to produce the One. The line narrows from Abraham to Isaac, from Isaac to Jacob, from Jacob to Judah, from Judah to David, from David to Christ. The seed promise is genealogically tracked through forty-two generations in Matthew 1 for exactly this reason. Christ is the Seed in whom the corporate seed finally accomplishes what it was made for.

Blessing

“In you all the families of the earth will be blessed” (Genesis 12:3). This is the part that turns the covenant outward. The promise to Abraham is not for Abraham's family alone — it is for everyone, eventually. The line that narrows down to one Seed exists in order to bless all the families of the earth through that Seed. This is the answer to Genesis 11. Babel scattered the nations in confusion; Abraham is called so that the nations might be regathered in blessing. Every Gentile who has ever come to faith in Christ has come in on the back of this promise. Paul will say so explicitly in Galatians 3:8: “The Scripture, foreseeing that God would justify the Gentiles by faith, preached the gospel beforehand to Abraham, saying, 'All the nations will be blessed in you.'”

1.5 — Circumcision: The Sign of the Covenant

Every covenant has a sign. The Noahic covenant had the rainbow. The Mosaic covenant will have the Sabbath. The New Covenant will have the bread and the cup. The Abrahamic covenant has circumcision — and it is the most personal sign of them all.

Thirteen years pass between Genesis 15 and Genesis 17. Abram is now ninety-nine. In that interval he has gone outside the promise once — taking Hagar as a second wife and fathering Ishmael — and God now returns to reaffirm and seal the covenant. He changes Abram's name to Abraham (“father of many”) and Sarai's to Sarah (“princess”), and He commands circumcision.

Several things about the sign are worth noticing. First, it is cut into the body. It is permanent. Every male descendant of Abraham will carry this mark for the rest of his life. Second, it is cut into the organ of generation — the place from which the promised seed will physically come. The sign is attached to the very mechanism the promise depends on. Third, it is not visible in public. Unlike the rainbow, which God sees and the world sees, circumcision is a private mark, between the covenant member and God. Fourth, it is given to infants — eight days old — long before they can understand or consent. The covenant precedes the child's awareness of it. The grace runs first.

Paul makes a great deal of the fact that Abraham was reckoned righteous in Genesis 15 and circumcised in Genesis 17. The faith came first. The sign followed. So the sign is not the basis of the righteousness — it is the seal of a righteousness already given by faith. This is why the New Testament can announce, without contradicting the Old, that Gentiles who believe receive the same righteousness Abraham did without being circumcised. The sign points to faith; faith does not point to the sign.

The prophets will eventually deepen this. Moses speaks of the “circumcision of the heart” in Deuteronomy 10:16 and 30:6. Jeremiah picks it up in Jeremiah 4:4. Paul says explicitly in Romans 2:29 that “he is a Jew who is one inwardly; and circumcision is that which is of the heart, by the Spirit, not by the letter.” The physical sign was always pointing at something deeper — a covenant cut into the heart, not the body. The New Covenant in Christ will accomplish what the outward sign only signified.

1.6 — Why This Covenant Cannot Fail

If everything depends on this covenant — and if Israel breaks every other covenant God makes with them — how can the Abrahamic covenant possibly hold? The answer is in two places: the moment in Genesis 15 when God walked alone, and the New Testament commentary on it in Hebrews 6.

The writer of Hebrews makes the argument plainly. When God made His promise to Abraham, “since He could swear by no one greater, He swore by Himself.” Two unchangeable things — the promise and the oath — are placed before the heirs of the promise so that they may have strong encouragement. The covenant is anchored not in Abraham's faithfulness, not in Israel's obedience, not even in the heir's worthiness. It is anchored in the character of God Himself.

This is why the covenant survives every breach Israel commits. Israel will worship the golden calf at the foot of Sinai. Israel will demand a king. Israel will follow that king into idolatry. Israel will be exiled, scattered, decimated. And the covenant will hold. The Abrahamic promise was never conditional on Israel keeping it. It was sworn by the One walking between the pieces alone.

And this is also why the covenant must produce Christ. The promise requires a perfect Seed. None of Abraham's descendants are perfect. So either the promise fails — and God breaks His self-imposed oath, which is impossible — or God provides the Seed Himself, from inside the human line, born of a woman, born under the law, but conceived by the Spirit and without sin. The logic of the Abrahamic covenant requires the incarnation. Once God walked alone between the pieces, the cross was the only way the story could end.

The Abrahamic covenant is the spine of the gospel. It tells you who God is (the One who keeps His word at His own cost), who Christ is (the Seed in whom every promise lands), and who you are if you are in Him (an heir of a covenant cut four thousand years before you were born, by a God who walked alone between the pieces so that you might walk with Him).

1.7 — Reflection

Before writing in the notes box below, sit with the central image of this module: God walking alone. Abram is asleep. The covenant is being cut. The price is being set. And the only feet between the pieces are God's.