Genesis 17:17-24

17And Abraham fell on his face and laughed, and said in his heart, Shall [a child] be born to him that is a hundred years old? and shall Sarah, who is ninety years old, bear?

18And Abraham said to 1God, Oh that Ishmael might live before thee!

19And 2God said, Sarah thy wife shall indeed bear thee a son; and thou shalt call his name Isaac; and I will establish my covenant with him, for an everlasting covenant for his seed after him.

20And for Ishmael I have heard thee: behold, I will bless him, and will make him fruitful, and will very greatly multiply him; twelve princes shall he beget, and I will make him a great nation.

21But my covenant will I establish with Isaac, whom Sarah shall bear to thee at this appointed time in the next year.

22And he left off talking with him; and 3God went up from Abraham.

23And Abraham took Ishmael his son, and all who were born in his house, and all who were bought with his money — every male among the people of Abraham's house — and circumcised the flesh of their foreskin on that same day, as 4God had said to him.

24And Abraham was ninety-nine years old when he was circumcised in the flesh of his foreskin.