Galatians 4:23
But the one by the bond-woman has been born after the flesh; and the one by the free-woman, through promise.
Hebrews 11:11
By faith Sarah herself also received power to conceive seed, even when past the age of child-bearing, since she accounted Him faithful, Who promised.
Romans 9:7-8
neither, because they are Abraham's seed, are they all children; but, "In Isaac shall your seed be called."
Romans 4:18-21
who, past hope, believed against hope, to the end that he might become the father of many nations, according to that which had been spoken, "So shall your seed be."
Romans 10:8
But what does it say? 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
But ye, brethren, after the manner of Isaac, are children of promise.