18. Then he asked God, “Why not let Ishmael inherit what you have promised me?”
19. But God answered:No! You and Sarah will have a son. His name will be Isaac, and I will make an everlasting promise to him and his descendants.
20. I have heard what you asked me to do for Ishmael, and so I will also bless him with many descendants. He will be the father of twelve princes, and I will make his family a great nation.
21. But your son Isaac will be born about this time next year, and the promise I am making to you and your family will be for him and his descendants for ever.