Genesis 17:19
King James Version
“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, with his seed after him.”
Context
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.
21But my covenant will I establish with Isaac, which Sarah shall bear unto thee at this set time in the next year.
22And he left off talking with him, and God went up from Abraham.