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.