Genesis 17:17-24

17Abraham fell facedown. Then he laughed and said to himself, “Can a child be born to a man who is a hundred years old? Can Sarah give birth at the age of ninety?” 18And Abraham said to God, “O that Ishmael might live under Your blessing!”

19But God replied, “Your wife Sarah will indeed bear you a son, and you are to name him Isaac.1 I will establish My covenant with him as an everlasting covenant for his descendants after him. 20As for Ishmael, I have heard you, and I will surely bless him; I will make him fruitful and multiply him greatly. He will become the father of twelve rulers, and I will make him into a great nation. 21But I will establish My covenant with Isaac, whom Sarah will bear to you at this time next year.”

22When He had finished speaking with Abraham, God went up from him.

23On that very day Abraham took his son Ishmael and all those born in his household or purchased with his money—every male among the members of Abraham’s household—and he circumcised them, just as God had told him.

24So Abraham was ninety-nine years old when he was circumcised,