Genesis 21:2-4

New American Standard Bible

^2 (A)So Sarah conceived and bore a son to Abraham in his old age, at ^(B)the appointed time of which God had spoken to him. ³ Abraham named his son who was born to him, the son whom Sarah bore to him, ^(C)Isaac. ⁴ Then Abraham circumcised his son Isaac when he was ^(D)eight days old, as God had commanded him.