15 God also said to Abraham, “As for Saraia your wife, you are no longer to call her Sarai; her name will be Sarah.b 16 I will bless her and will surely give you a son by her.c I will bless her so that she will be the mother of nations;d kings of peoples will come from her.”

17 Abraham fell facedown;e he laughedf and said to himself, “Will a son be born to a man a hundred years old?g Will Sarah bear a child at the age of ninety?”h 18 And Abraham said to God, “If only Ishmaeli might live under your blessing!”j

19 Then God said, “Yes, but your wife Sarah will bear you a son,k and you will call him Isaac.d l I will establish my covenant with himm as an everlasting covenantn for his descendants after him.