15. And God said to Abraham, As for Sarai thy wife, thou shalt not call her name Sarai, but Sarah shall her name be.
16. And I will bless her, and give thee a son also by her: yea, I will bless her, and she shall be a mother of nations; kings of people shall proceed from her.
17. Then Abraham fell upon 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, O that Ishmael might live before thee!
19. And God said, Sarah thy wife shall bear thee a son indeed; and thou shalt call his name Isaac: and I will establish my covenant with him for an everlasting covenant, and with his seed after him.
20. And as for Ishmael, I have heard thee: Behold, I have blessed him, and will make him fruitful, and will multiply him exceedingly; 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 set time in the next year.
22. And he ceased talking with him, and God went up from Abraham.