One of them said, “Nine months from now I will come back, and your wife Sarah will have a son.” Sarah was behind him, at the door of the tent, listening.
By faith he lived as a foreigner in the country that God had promised him. He lived in tents, as did Isaac and Jacob, who received the same promise from God.
But God said, “No. Your wife Sarah will bear you a son and you will name him Isaac. I will keep my covenant with him and with his descendants forever. It is an everlasting covenant.