Galatians 4:23
But the one by the bondmaid was born according to the flesh; the other, by the free woman, was by promise.
Hebrews 11:11
By faith also Sarah herself received strength for the conception of seed, and brought forth a child when past the time of life, because she counted him faithful who had promised.
Romans 9:7-8
Nor, because they are the posterity of Abraham, are they all children: but in Isaac shall your posterity be called.
Romans 4:18-21
He, against hope, confidently believed that he would become the father of many nations, according to that which was spoken: So shall your posterity be.
Romans 10:8
But what says it? The word is near you, in your mouth and in your heart; that is, the word of faith which we preach;
Galatians 4:28-29
We, indeed, brethren, like Isaac, are children of promise.