Genesis 17:17
King James Version
“Then Abraham fell upon his face, and laughed, and said in his heart, Shall be born unto him that is an hundred years old? and shall Sarah, that is ninety years old, bear?”
Context
14And the uncircumcised man child whose flesh of his foreskin is not circumcised, that soul shall be cut off from his people; he hath broken my covenant.
15And God said unto Abraham, As for Sarai thy wife, thou shalt not call her name Sarai, but Sarah her name
16And I will bless her, and give thee a son also of her: yea, I will bless her, and she shall be of nations; kings of people shall be of her.
17Then Abraham fell upon his face, and laughed, and said in his heart, Shall be born unto him that is an hundred years old? and shall Sarah, that is ninety years old, bear?
18And Abraham said unto God, O that Ishmael might live before thee!
19And 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, with his seed after him.
20And 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.