15. And God said to Abraham, As to Sarai thy wife, thou shalt not call her name Sarai, but Sarah shall be her name.
16. And I will bless her, and I will give thee a son also of her; and I will bless her, and she shall become nations: kings of peoples shall be of her.
17. And 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?
18. And Abraham said to God Oh that Ishmael might live before thee!
19. And God 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.
20. And 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.
21. But my covenant will I establish with Isaac, whom Sarah shall bear to thee at this appointed time in the next year.
22. And he left off talking with him; and God went up from Abraham.
23. And 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 God had said to him.
24. And Abraham was ninety-nine years old when he was circumcised in the flesh of his foreskin.
25. And Ishmael his son was thirteen years old when he was circumcised in the flesh of his foreskin.
26. In the selfsame day was Abraham circumcised, and Ishmael his son;
27. and all the men of his house, born in his house, or bought with money of the stranger, were circumcised with him.