15 God said to Abraham, “As for your wife Sarai, do not call her Sarai, for SarahI will be her name. 16 I will bless her; indeed, I will give you a son by her.l I will bless her, and she will produce nations; kings of peoples will come from her.”

17 Abraham fell facedown. Then he laughedm and said to himself, “Can a child be born to a hundred-year-old man? Can Sarah, a ninety-year-old woman, give birth?” 18 So Abraham said to God, “If only Ishmael were acceptableJ to you!”

19 But God said, “No. Your wife Sarah will bear you a son, and you will name him Isaac.K I will confirm my covenant with him as a permanent covenant for his future offspring. 20 As for Ishmael, I have heard you. I will certainly bless him; I will make him fruitful and will multiply him greatly. He will father twelve tribal leaders,n and I will make him into a great nation. 21 But I will confirm my covenant with Isaac, whom Sarah will bear to you at this time next year.”o