Genesis 17 returns to the covenant of Genesis 15↗ thirteen years later. Ishmael is now a teenager; Sarai is ninety; Abram is ninety-nine. The promise of innumerable seed through Sarai has had a long silence, and the chapter opens with the Lord breaking it with a new divine name: “I am the Almighty God” — El Shaddai. The name is the first explicit occurrence of this epithet in canonical Scripture; it will become the characteristic patriarchal divine name, the name by which (Exodus 6:3↗ later records) God was known to Abraham, Isaac, and Jacob.
The covenant the Lord renews is the same covenant of Genesis 12↗ and Genesis 15↗, now with two new external signs and a clarified central promise. The first sign is the renaming. Abram — “exalted father” — becomes Abraham , “father of a multitude of nations.” The added syllable carries the covenant promise into the man’s daily name. Sarai becomes Sarah — the renaming less etymologically transparent but theologically explicit: she will be “a mother of nations; kings of people shall be of her.” She, not Hagar, is the appointed channel of the promise. The chapter’s clarification — already implicit in chapters 12 and 15 — is now made plain: the heir will come through Sarah, not through Hagar’s son.
Abraham’s response to the promise of a son to ninety-year-old Sarah is laughter. “Then Abraham fell upon his face, and laughed, and said in his heart, Shall a child be born unto him that is an hundred years old? and shall Sarah, that is ninety years old, bear?” The laughter is the chapter’s quiet honesty — the patriarch’s faith is real but the promise still strikes him as absurd. He pleads instead for Ishmael: “O that Ishmael might live before thee!” God answers gently. Ishmael will be blessed; twelve princes will come from him; he will become a great nation. But the covenant proper — the berith — will be with Isaac, the not-yet-conceived son Sarah will bear in the appointed year. The chapter is careful not to abandon Ishmael; it is equally careful not to reroute the covenant through him.
The second sign is the covenant in the flesh: circumcision . Every male of Abraham’s household — born in the house or bought with money, eight days after birth from this point forward — is to be circumcised. The covenant is berith olam — an everlasting covenant — marked in the body. The text dwells on the sign with unusual specificity: who is to be circumcised, when, what the consequence is of failure. Abraham obeys that very day; Ishmael at thirteen and Abraham at ninety-nine are circumcised together, and all the men of the household with them.
The chapter joins to Genesis 15 in a way the Apostle Paul will later make load-bearing. Genesis 15:6↗ records Abraham’s faith being “counted to him for righteousness”; Genesis 17 records the covenant sign of circumcision. The chapter ordering matters. In Romans 4:11↗, Paul argues that Abraham received “the sign of circumcision, a seal of the righteousness of the faith which he had yet being uncircumcised” — the righteousness reckoned in chapter 15, before the sign of chapter 17, makes Abraham “the father of all them that believe, though they be not circumcised.” Paul’s whole argument for Gentile inclusion turns on the ordering of these two chapters.
The New Testament will eventually relocate the covenant sign from flesh to heart. Galatians 5:6↗ — “in Jesus Christ neither circumcision availeth any thing, nor uncircumcision; but faith which worketh by love.” Colossians 2:11↗ reads baptism as “the circumcision made without hands… by the circumcision of Christ.” The physical sign Genesis 17 institutes will be fulfilled and transformed in the new covenant. But the underlying logic — covenant sealed in the body of the covenant people — carries forward, into baptism and the laying on of hands in the early Church, into the ordinances and sacraments of the later Christian and Latter-day Saint traditions. The covenant marked in the body of God’s people is older than Moses, and has not ended in any subsequent dispensation.
Language & Translation Notes
The Abrahamic name change and what it carries. The renaming of Abram to Abraham is more than wordplay. Hebrew names in the patriarchal narratives carry vocational weight — Adam from adamah, Eve as mother of all living, Jacob as supplanter, Israel as God-striver. The added syllable in Abraham’s name encodes the promise of “a multitude of nations” into every utterance of the patriarch’s name from that point. The same will be true of Sarah’s renaming and, in later chapters, of Jacob becoming Israel (Genesis 32:28↗). In Latter-day Saint reading, the giving of a new name in covenant — preserved in temple ordinances and elsewhere — has its canonical taproot here.
Circumcision in canonical and post-canonical theology. The institution of circumcision in Genesis 17 carries forward through the Mosaic Law (Leviticus 12:3↗) into the apostolic-era debate over Gentile believers (Acts 15↗). The deepest OT trajectory, however, runs toward “circumcision of the heart” — Moses commands it (Deuteronomy 10:16↗, Deuteronomy 30:6↗), Jeremiah names it (Jeremiah 4:4↗), Paul makes it the only circumcision that ultimately matters (Romans 2:29↗). The physical sign points beyond itself from its first institution; the chapter’s own language of berith olam names a covenant that has its body in the flesh but its center somewhere deeper.