Genesis 17:18-20

And then he spoke out loud: “O, that Ishmael might prosper with your blessing!” God said, “Listen to me. I promise that you and Sarah will have a son, and you will call him Isaac. I will confirm my everlasting covenant of love with him and his seed. And regarding Ishmael, I have heard your cry and I will indeed bless him. I will cause him to have many, many descendants. He will father twelve rulers, and I will make him into a great nation.