Galatians 4:23
But he truly of the bondmaid was born according to the flesh; and he of the free through the promise.
Hebrews 11:11
By faith Sara also herself received power for the laying down of seed, and brought forth during the time of age, for she deemed him faithful having promised.
Genesis 18:10-14
And he will say, Returning, I will return to thee according to the time of life; and behold, a son to Sarah thy wife. And Sarah heard at the door of the tent, and she behind him.
Genesis 21:1-2
And Jehovah reviewed Sarah as he said; and Jehovah will do to Sarah as he spake.
Romans 9:7-8
Neither that the seed of Abraham, are all children: but, In Isaac shall the seed be called to thee.
Genesis 17:15-19
And God will say to Abraham, Sarai, thy wife, thou shalt not call her name Sarai, for Sarah her name.
Romans 4:18-21
Who against hope believed upon hope, for him to become father of many nations, according to that said, So shall thy seed be.
Romans 10:8
But what does it say? The word is near thee, in thy mouth, and in thy heart: that is, the word of faith, which we proclaim;
Galatians 4:28-29
And we, brethren, as Isaac, are children of promise.