But he who was of the bondwoman was born after the flesh; but he of the free woman was by promise.
Through faith also Sara herself received strength to conceive, and was delivered of a child when she was past age, because she judged him faithful who had promised.
But what says it? The word is near you, even in your mouth, and in your heart: that is, the word of faith, which we preach;
For it is written, that Abraham had two sons, the one by a bondmaid, the other by a free woman.