And he who was of the servant was born according to the flesh. But he who was of the free woman was born by the promise.
But what does Scripture say? "The word is near, in your mouth and in your heart." This is the word of faith, which we are preaching.
For it is written that Abraham had two sons: one by a servant woman, and one by a free woman.
By faith also, Sarah herself, being barren, received the ability to conceive offspring, even though she was past that age in life. For she believed him to be faithful, who had promised.