¹⁵ And God said unto 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 of her: yea, I will bless her, and she shall be a mother of nations; kings of people shall be of her.

¹⁷ Then Abraham fell upon his face, and laughed, and said in his heart, Shall a child be born unto him that is an hundred years old? and shall Sarah, that is ninety years old, bear?

¹⁸ And Abraham said unto 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, which Sarah shall bear unto thee at this set time in the next year.

¹¹ Now Abraham and Sarah were old and well stricken in age; and it ceased to be with Sarah after the manner of women.

¹² Therefore Sarah laughed within herself, saying, After I am waxed old shall I have pleasure, my lord being old also?

¹³ And the Lord said unto Abraham, Wherefore did Sarah laugh, saying, Shall I of a surety bear a child, which am old?

¹⁴ Is any thing too hard for the Lord? At the time appointed I will return unto thee, according to the time of life, and Sarah shall have a son.

21 And the Lord visited Sarah as he had said, and the Lord did unto Sarah as he had spoken.

² For Sarah conceived, and bare Abraham a son in his old age, at the set time of which God had spoken to him.