And God said, Sarah your wife shall bear you a son indeed. And you shall call his name Isaac. And I will establish My covenant with him for an everlasting covenant, and with his seed after him.
And He said, I will certainly return to you according to the time of life, and lo, Sarah your wife shall have a son. And Sarah heard in the tent door which was behind Him.
And He gave him the covenant of circumcision. And so Abraham fathered Isaac and circumcised him the eighth day. And Isaac fathered Jacob, and Jacob the twelve patriarchs.
By faith also Sarah herself received strength to conceive seed and was delivered of a child when she was past age, because she judged Him who had promised to be faithful.