The book of Genesis is the book of genealogies, the study of the earliest generations. In Genesis 12-25 the patriarch Abraham takes center stage. God’s call on one man—from whom He would make a nation and relate directly with them—complements the scattering of languages in Genesis 11. Through Abraham and his descendants, God would reveal Himself to all peoples (Gen 12:1-3). The international scope of the Abrahamic covenant casts a shadow extending across Scripture’s storyline. In Rev 7:9, John described a multi-national chorus singing God’s praises. John wrote that the leaves of the trees surrounding the river flowing from God’s throne in the New Jerusalem were powerful enough to heal the nations (Rev 22:1-2).
The concept of land introduced in Genesis 12 plays a significant role in God’s redemptive plan. God set forth the land of Canaan as a place where His special people would one day dwell in safety, rest, and obedience—making the other nations jealous for a God like the Lord of Israel (Deut 4:1-8; Josh 21:43-45). The patriarchs took this promise so seriously that Jacob—even at a time of severe famine and when his son Joseph was ruling in the prosperous land of Egypt—was hesitant to leave Canaan (Gen 46:1-7). While the Israelites initially failed to enter the Promised Land, displaying cowardice when provided the opportunity for conquest at the southern edge of Kadesh-Barnea (Numbers 13-14; see Psalm 95), they eventually entered the land under Joshua. The construction of Solomon’s massive, ornate temple was intended to signify Israel’s permanence in Canaan (1 Kings 8-9//2 Chronicles 6-7). But it did not last. In time the Lord removed Abraham’s descendants from the land because of their propensity toward idolatry (2 Kings 17, 24)—just as Moses predicted in Deuteronomy 28-30.
The author of Hebrews saw in the scenes of Genesis 12-14 themes and events that helped him explain the days of fulfillment in Jesus, God’s Son.
(1) The promise of land and rest and peace from enemies is enjoyed spiritually through the new covenant and faithfulness to Jesus. The author of Hebrews deduced that under Joshua the people never experienced the rest God intended for them in the land of Canaan—and his audience was in danger of not fully enjoying the promise of rest in Christ, writing: “For if Joshua had given them rest, He would not have spoken of another day. A Sabbath rest remains, therefore, for God’s people. For the person who has entered His rest has rested from his own works, just as God did from His. Let us then make every effort to enter that rest, so that no one will fall into the same pattern of disobedience” (Heb 4:8-11). For the author of Hebrews, “rest in Christ” was synonymous with the kind of courageous faith Abraham displayed when he responded to God’s call and set out to a place he did not know (Heb 11:8-9). Abraham looked forward by faith to what God had for him (Heb 11:10). Abraham was searched-out by God’s word of promise and was approved for his faithfulness. The author of Hebrews concluded his exhortation about faith and rest in Hebrews 3-4 by noting that God’s word is living and active to judge the thoughts of the heart (Heb 4:12-14).
(2) Jesus’ priesthood in the new covenant is eternal—like that of Melchizedek. The priest who met Abraham in Genesis 14 is referenced in the New Testament only by the author of Hebrews, in chs. 5-7. He used Melchizedek’s priesthood to legitimate Jesus’ priesthood. The record of Melchizedek in Gen 14:17-24 provides no genealogy—so important for the concept of priesthood in Judaism (see 1 Chronicles 6-7; 23-26). If Melchizedek had no genealogy, he must have been an eternal priest, the author of Hebrews deduced. Jesus, too, has an eternal priesthood. And Melchizedek was recognized as a priest even though he was not of the descendants of Levi, preceding them by many generations. So, Jesus—as a descendant of Judah and not Levi—could also serve as a legitimate priest. But in Hebrews, Jesus is more than Melchizedek. Only Jesus is the Son of God who offered Himself to atone for the sins of His people. Access to God comes through Jesus alone.

Genesis 15-17; Psalm 32
Genesis 15-17 further establishes Abraham’s role in the metanarrative of Scripture. Paul employed the real-life events of Abraham to illustrate the blessings and allegiance that correspond to faith in Jesus Christ. By the time of Genesis 15, Abraham did not yet have a single blood-line heir—let alone enough posterity to be called a great nation as God had promised in Gen 12:2. Then the word of the Lord came to Abraham saying: “Look at the sky and count the stars, if you are able to count them…Your offspring will be that numerous” (Gen 15:5). Abraham responded with courageous faith and the Lord credited Abraham’s response as righteousness (Gen 15:6), establishing Abraham as the model of faith. God affirmed Abraham’s faith through the smoking fire pot and flaming torch—reminding the patriarch that he would not only become a great nation, but that his descendants would also dwell in the Promised Land (Gen 15:9-21).
Nevertheless, the first words of Genesis 16 reveal that Abraham was yet waiting on the fulfillment of God’s promise: “Abram’s wife Sarai had not borne him children” (Gen 16:1). Sarah interpreted God’s delay as a definitive act, saying, “Since the LORD has prevented me from bearing children, go to my slave; perhaps I can have children by her” (Gen 16:2). Abraham failed to respond appropriately in this crisis of faith and the result was not what Sarah had intended; rather than fulfilled, her life was made bitter by the birth of Ishmael to Hagar (Gen 16:4-7).
Genesis 17 records God’s covenant affirmation to Abraham, given years after Abraham’s unfaithful act with Hagar. God promised that He would bring many descendants from Abraham and Sarah’s union. To give Abraham a constant reminder of this promise, God changed his name from Abram to Abraham (“father of nations”) and promised again that Abraham’s descendants would have their own territory (Gen 17:1-8). God commanded Abraham to circumcise both of his sons (Gen 17:9-14). Thus, the anatomical locale of procreation was marked for God’s special purpose, reminding future generations that only by God’s help could their nation increase in number and carry on. The sign of circumcision reminded Abraham’s descendants that they were a special people, heirs of promise and faith. In Gen 17:15-22, God affirmed that the child of promise would be born to Abraham through Sarah—stating the exact time the child would be born.
The events in Genesis 15-17 provide the blueprint for understanding God’s redemptive plans. Paul saw in God’s promise to Abraham and the patriarch’s faith a framework for how sinful humans could be made right with God.
(1) In Romans 4, Paul wrote that sinful humanity’s inability to be right with God apart from divine intervention reflects Abraham and Sarah’s inability to conceive. In Rom 4:4-8, Paul wed the concept of faith expressed by Abraham (Genesis 15) with the theme of forgiveness in Psalm 32. Paul wrote that if someone works, payment is not a gift but what is owed to them. In Gen 15:6, however, God bestowed righteousness to Abraham on the basis of Abraham’s faith, before giving Abraham the covenant of circumcision in Gen 17:1-14. Paul saw in God’s kindness to Abraham a link with David’s description of the joy that comes upon those whose sins are covered (Ps 32:1-2).
(2) The bulk of Paul’s argument to the Galatians was based upon the record of Abraham in Genesis 15-17. In Gal 3:6-18, Paul set forth the faith (and justification) of Abraham to help the Galatians understand that they needed faith and the Spirit, not circumcision or obedience to the law, to be justified. Paul said the purpose of Christ’s work was “that the blessing of Abraham would come to the Gentiles in Christ Jesus so that we could receive the promise of the Spirit through faith” (Gal 3:14). The chronological flow of the Scripture storyline was fundamental to Paul’s argument: since Abraham received the promise of justification by faith more than 400 years before the law was given on Mount Sinai, all who had faith like Abraham became heirs apart from the law.
Commentary Genesis with Select Psalms and Proverbs Old Testament