Galatians 4:23
How is it that the son by the slave woman is born after the flesh; but the son by the freewoman is born through promise?
Hebrews 11:11
By faith Sarah received strength to conceive seed when she was past age, since she counted him faithful who promised.
Genesis 18:10-14
He said: Next year I will give you and Sarah a son. (Sarah was listening in the tent door behind him.)
Genesis 21:1-2
Jehovah was gracious to Sarah, as he had said. Jehovah did for Sarah what he had promised.
Romans 9:7-8
It is not because they are Abraham's that they are all children, but: What will be called 'your seed' will be through Isaac. (Genesis 21:12)
Genesis 17:15-19
God continued: Do not call your wife Sarai any longer. Her name will be Sarah.
Romans 4:18-21
In hope against hope Abraham believed that he might become a father of many nations, according to that which had been spoken: So your descendants will be.
Romans 10:8
But what does it say? The word is near you, in your mouth and in your heart. It is the word of faith, which we preach. (Deuteronomy 30:8-20)
Galatians 4:28-29
Brothers, we are children who belong to the promise, the same as Isaac was.