15 Then God said to Abraham, “As for your wife, you must no longer call her Sarai; Sarah will be her name. 16 I will bless her and will give you a son through her. I will bless her and she will become a mother of nations. Kings of countries will come from her!” 17 Then Abraham bowed down with his face to the ground and laughed as he said to himself, “Can a son be born to a man who is a hundred years old? Can Sarah bear a child at the age of ninety?” 18 Abraham said to God, “O that Ishmael might live before you!” 19 God said, “No, Sarah your wife is going to bear you a son, and you will name him Isaac. I will confirm my covenant with him as a perpetual covenant for his descendants after him.

15 And the Lord said to Abraham, The name of Sara thy wife shall not be called Sara, for Sarah shall be her name: 16 and I will bless her, and I will also give thee a son from her; and I will bless her, and assemblies and kings which have dominion over peoples from her shall be. 17 And Abraham fell upon his face and rejoiced, and said in his heart, Will the son of a hundred years have a child, and Sarah the daughter of ninety years bring forth? 18 And Abraham said before the Lord, O that Yishmael may be established before thee! 19 And the Lord said, In verity Sarah thy wife shall bear thee a son, and thou shalt call his name Izhak; and I will establish My covenant with him for an everlasting covenant to his sons after him.