God's covenant with Abram: faith credited as righteousness and the oath between the pieces

Genesis 15 belongs to the Torah, which Jewish and Christian tradition attributes to Moses, and is part of the account of Abram that begins in Genesis 12. Critical scholars have often seen this chapter as a combination of earlier traditions, since it twice describes the same promise of an heir and the same promise of the land, and some see layers from different periods. Other scholars read the chapter as a unity in which the heir and the land are two questions and two answers. The date of Abram is usually set in the early second millennium BC, though this is debated. The first hearers were Israel in the wilderness or the land, or later in exile; in each case the chapter answered the question of what their hope rested on.

The chapter comes after the war of the kings in chapter 14 and Abram's meeting with Melchizedek. Abram has left Haran, has been in Canaan for some time, and has no son. In the world of the Bible, an heir was the means by which a family name, property and religious duties continued. A childless man might adopt a household member as heir, and Abram mentions Eliezer of Damascus, a servant, as the heir by default. The question of the chapter is the question of whether God's promise in 12:1-3 will happen at all.

The covenant ceremony would have been recognisable to ancient hearers. In the ancient Near East, treaties were sealed with oaths, and the Hebrew idiom for making a covenant was 'to cut' (karat) one. A parallel appears in Jeremiah 34:18-20, where leaders pass between the halves of a calf to bind themselves to an oath, with the implication that the penalty for breach is the fate of the animals.

Genesis 15 is narrative with two speeches at its heart, each beginning with the word of the LORD and each drawing a question from Abram. In verse 2 Abram asks about the heir, and in verse 8 about how he can know that he will inherit the land. Both questions are met with a sign: the stars, and the covenant ceremony. This double pattern is the key to the structure. Abram's questions are not rebuked. The text allows a believer to bring honest questions to God, and the answer to each is something to see.

The chapter also has a shape in time. It moves from day to evening, from vision to deep sleep to night, from promise to terror and darkness to a flame in the dark. Light and darkness are a recurring theme in the Bible's covenant moments. Within the story, the deep sleep (tardemah) is the same word used for the sleep God put on Adam in 2:21: God acts while the man is helpless.

Two rules guide interpretation.

• First, read verse 6 in its place. The statement 'Abram believed the LORD' comes after the promise of descendants, so what Abram believes is a specific promise, and it is trusted before it is seen.
• Second, read the covenant ritual in terms of its first meaning. The pieces and the passing are an oath-sign, and the unusual feature is that only God passes. Jeremiah 34 suggests that those who bound themselves passed between the pieces. Here Abram sleeps. The meaning is that the burden of the promise is carried by God alone.

Verse 1

'Do not be afraid, Abram. I am your shield, your very great reward.' Here the word of the LORD comes to Abram in a vision, the way it later comes to the prophets. 'Shield' (magen) speaks of protection, and the 'reward' is God himself, not a prize that God gives. After the war of chapter 14, Abram has refused the king of Sodom's wealth, and God answers that he himself is Abram's portion.

Verses 2–4

Abram's complaint is honest: he is childless, and a servant, Eliezer of Damascus, will inherit his house. The word of the LORD answers: not him, but one from your own body.

Verses 5–6

God takes Abram outside and tells him to look at the stars and count them if he can. The promise is a vast family. Verse 6 is the key sentence of the chapter: Abram believed the LORD, and it was credited to him as righteousness. The verb 'believed' (he'emin) comes from the root of 'amen' and means to trust as firm and reliable. 'Credited' (chashav) is an accounting word, used of putting something to someone's account. 'Righteousness' (tsedaqah) here means standing right with God and being counted as faithful to the relationship. The sentence does not say Abram earned it by a work. His response is to trust.

Verses 7–8

God identifies himself as the one who brought Abram from Ur to give him this land. Abram asks, 'How can I know?', not in unbelief but seeking assurance.

Verses 9–11

God directs him to bring a heifer, a goat and a ram, each three years old, a dove and a pigeon. Abram cuts the animals in two and lays the halves opposite each other, but not the birds. Birds of prey come down, and Abram drives them away. Interpreters have seen in the birds a picture of threats to the promise, though the text does not explain them.

Verses 12–16

At sunset a deep sleep falls on Abram, and with it dread and great darkness. God foretells that Abram's descendants will be strangers in a foreign land, enslaved and mistreated for four hundred years, and that God will judge the nation they serve and bring them out with great possessions. The number is round; Exodus 12:40 gives 430 years and Paul follows that count in Galatians 3:17. The return will be in the fourth generation, 'for the iniquity of the Amorites is not yet complete'. The Amorites here stand for the peoples of Canaan. God is patient with them, and the land will not be given until their sin has reached its limit. Abram, by contrast, will die in peace.

Verses 17–21

After dark, a smoking firepot and a flaming torch pass between the pieces. Fire and smoke are signs of God's presence (Exodus 3:2; 13:21; 19:18). God alone takes the oath. The covenant is stated: to your descendants I have given this land, from the river of Egypt to the Euphrates, and ten peoples are listed. 'Have given' is again the language of promise treated as accomplished.

Genesis 15 is a central chapter for the doctrine of justification. The Bible's first statement that someone is counted righteous says that it comes by trust in God's promise. Paul builds on this in Romans 4 and Galatians 3, arguing that because Abram was counted righteous before circumcision (Genesis 17) and before the law, righteousness is by faith for Jew and Gentile alike. James 2:21-24 quotes the same verse to show that faith which is real is shown by works, citing Abraham's offering of Isaac.

Christians have understood the relation in different ways. In Protestant teaching, from Luther and Calvin on, justification is God's declaring a sinner righteous on the ground of Christ, received through faith alone, and James speaks of the evidence of that faith. The Catholic tradition holds that justification includes an inward renewal by grace, and that faith is completed by love and works that grow from grace (Council of Trent); a Joint Declaration signed by Lutherans and the Catholic Church in 1999 states that the two traditions share a basic understanding of justification. Orthodox theology speaks less of a legal declaration and more of healing and union with God. All of them hold that the first move is God's.

The chapter also teaches that the covenant depends on God. The stars promise a family, and the fire in the night promises that God himself will see it through. It shows God's patience with the nations in verse 16, and his sovereign plan for the slavery in Egypt. The Exodus, with its plagues and plunder, is the fulfilment of verses 13 and 14 (Exodus 12:35-41).

The strongest link is fulfillment, and the New Testament makes it. Paul says that the words 'it was credited to him' were written not for Abraham alone but for us, who believe in the God who raised Jesus our Lord from the dead, who was delivered over for our trespasses and raised for our justification (Romans 4:23-25). He adds that those who share Abraham's faith are his true children (Galatians 3:7), and that Christ is the offspring through whom the blessing comes (Galatians 3:16). So the stars of Genesis 15:5 are fulfilled in the multitude from every nation who trust Christ (Romans 4:16-18).

The covenant ceremony is best read as an echo. God alone passes between the pieces while Abram sleeps. He takes the oath's penalty on himself, and many readers hear in this a first hint of the God who bears the cost of the covenant on the cross. Hebrews 6:13-18 points in this direction without citing the passage, saying that God swore by himself, since he had no one greater, so that his promise would be sure. Galatians 3:13 says that Christ redeemed us from the curse of the law by becoming a curse for us. The New Testament does not tie these directly to the cut animals, so this connection is held as a tentative echo and not as settled typology.

Finally, the foretold slavery and rescue in verses 13 to 16 is a promise that is fulfilled in the Exodus. The Exodus is in turn the pattern that Christ fulfils: the deliverer who brings his people out (Luke 9:31).