When modern readers encounter the covenant ceremony of Genesis 15, they tend to read it as a solemn but somewhat obscure ritual whose details are not especially important. God makes a promise to Abraham; animals are sacrificed; a smoking fire pot passes between them. Strange, but essentially a divine promise with dramatic staging.

The original audience would have recognised it immediately - and been stunned by what it meant.

Understanding the ancient Near Eastern background of covenant-making transforms Genesis 15 from an obscure ceremony into the most extraordinary moment in the pre-New Testament scriptures. And it illuminates what Jesus was doing at the Passover table, what God was accomplishing at Calvary, and why the covenant established there cannot be annulled, renegotiated, or supplemented by human performance.

How Covenants Were Made in the Ancient World

In the ancient Near East, covenants were not contracts - written agreements between parties who remained separate and dealt with each other at arm's length. They were bonds that created a new relationship between the parties - relationships as close as blood kinship, carrying obligations and protections that could be more binding than family ties.

The most solemn form of covenant ratification involved the cutting of animals. The Hebrew phrase for making a covenant is literally karat berit - to cut a covenant. Animals were slaughtered and divided down the middle, and the two halves were laid on the ground with a path between them. The parties to the covenant then walked between the divided pieces - a self-maledictory oath, a living visual curse: "May what happened to these animals happen to me if I break the terms of this covenant." The blood on the ground was not decoration. It was the consequence made visible. This is what covenant-breaking costs. This is what I swear over my own life.

The ritual communicated what no written document could fully express: total, personal, irrevocable commitment, backed by the covenant-maker's own life. To walk between the pieces was to say: I am bound to this. If I fail, let my blood be on the ground.

Genesis 15 - The Covenant Only One Party Walked

With that background, Genesis 15 becomes extraordinary. God instructs Abraham to prepare the animals - a heifer, a goat, a ram, a turtledove, a young pigeon - and divide them. Abraham lays the halves out and waits. Then evening comes, a deep sleep falls on Abraham, and God appears as a smoking fire pot and a flaming torch.

And God passes between the pieces. Alone.

Abraham does not walk between the pieces. He is asleep. Only God passes through. Only God swears the self-maledictory oath. Only God puts his life - his own divine existence - on the line as the guarantee of the covenant's fulfilment.

This is the theological point that Paul builds everything on in Galatians 3:15–18. The covenant made with Abraham was not a bilateral agreement that could be annulled by Abraham's failure to hold up his end. It was a unilateral divine oath - God binding himself, unconditionally, to bring the promise to fulfilment regardless of anything Abraham or his descendants did or failed to do. "When God made a promise to Abraham, since he had no one greater by whom to swear, he swore by himself." (Hebrews 6:13)

This is why Paul argues that the Mosaic law - given 430 years later - cannot annul the Abrahamic covenant. You cannot add conditions to an unconditional oath after the fact. The Mosaic covenant was added alongside the Abrahamic promise, for a specific purpose and a specific time. It was never the basis of the promise. The promise rested on God's oath alone - sworn by God himself, over his own life, as the only party who walked between the pieces.

The Last Supper - A Blood Covenant Ratification

When Jesus takes the third cup of the Passover Seder - the cup of redemption - and says "This cup is the new covenant in my blood" (Luke 22:20), every Jewish listener at the table would have understood the covenant framework he was invoking. He was announcing the ratification of a new covenant, and naming his own blood as the covenant-making blood.

In blood covenant terms: he was announcing that he was about to walk between the pieces. Alone. On behalf of both parties. The new covenant would be established not by God and humanity walking together through the ritual, but by God in human flesh - the mediator who is simultaneously both parties - absorbing in his own body the full cost of covenant-breaking, so that the covenant could be established on the same unconditional basis as the Abrahamic promise.

Hebrews 9:15–17 makes the covenant-death connection explicit: a covenant is ratified by death, and the new covenant was ratified by the death of the mediator. "Therefore he is the mediator of a new covenant, so that those who are called may receive the promised eternal inheritance, since a death has occurred that redeems them from the transgressions committed under the first covenant."

The covenant is sealed in blood. The mediator has walked between the pieces. The oath has been sworn at the cost of a life. This covenant cannot be undone.

Suzerain-Vassal Treaties - The Other ANE Parallel

Ancient Near Eastern scholarship has identified a second relevant background for the Mosaic covenant in particular: the suzerain-vassal treaty. In the political world of the second millennium BC, great kings (suzerains) made treaties with smaller kings (vassals) that followed a distinctive form: historical prologue (what the great king has done for the vassal), stipulations (what the vassal owes in response), blessings for obedience, and curses for violation.

Deuteronomy follows this structure almost exactly. God rehearses what he has done for Israel (historical prologue), lays out the Torah (stipulations), and specifies blessings and curses (Deuteronomy 28). The Mosaic covenant is a suzerain-vassal treaty in which Israel is the vassal people, bound to obedience, with the blessings and curses as the covenant sanctions.

This structure illuminates why the Mosaic covenant was bilateral - unlike the Abrahamic covenant. Israel said "all that the Lord has spoken we will do" (Exodus 19:8). Both parties walked through the ritual. Both parties were bound. And when Israel broke the covenant - as the prophets repeatedly declared - the covenant curses of Deuteronomy 28 applied: exile, dispersion, the destruction of the temple and the city.

The contrast with the Abrahamic covenant could not be sharper. The Abrahamic covenant rests on God's unconditional oath. The Mosaic covenant rests on Israel's conditional compliance. Both were genuine covenants. They were not the same covenant. And the new covenant - as Jeremiah 31 explicitly states - is "not like the covenant I made with their fathers when I took them by the hand to lead them out of Egypt, my covenant that they broke." It is a new covenant, established on the Abrahamic model: unconditional, unilateral, ratified by the death of the one who swore it.

What This Means for the HRM's Covenant Framework

The HRM's covenant theology tends to collapse the distinction between the Abrahamic and Mosaic covenants, treating them as essentially the same covenant extended and developed. Torah observance becomes the ongoing expression of the covenant relationship that began with Abraham and continues through the new covenant. The conditions of the Mosaic covenant - Torah faithfulness - become the expected response within the new covenant.

But the ANE background makes the distinction between these two kinds of covenant structurally visible. The Abrahamic covenant is a unilateral blood oath - God passed between the pieces alone. The Mosaic covenant is a bilateral suzerain-vassal treaty - Israel agreed to the stipulations. The new covenant is explicitly modelled on the former, not the latter: it is established by death, ratified unilaterally, and grounded in God's own faithfulness rather than human covenant-keeping.

This is Paul's entire argument in Galatians. The gospel is not the Mosaic covenant updated. It is the Abrahamic promise arrived - the unconditional oath finally fulfilled in the promised offspring, established in his blood, secured by his resurrection, available to all who are in him by faith. Adding Torah observance to that covenant is not maintaining it. It is misunderstanding what kind of covenant it is - and reaching back to a different covenant structure that the death of Christ has brought to its appointed end.

The fire pot passed between the pieces. The blood has been shed. The oath has been sworn. What God promised to Abraham - blessing for all nations through his offspring - has been accomplished. The covenant stands on God's own life. And that means it stands forever.

When God made a promise to Abraham, since he had no one greater by whom to swear, he swore by himself. - Hebrews 6:13