Galatians 4:23
However, the son by the handmaid was born according to the flesh, but the son by the free woman was born through promise.
Hebrews 11:11
By faith he received power to procreate when he was past age, and Sarah herself was barren. He regarded him faithful who had promised.
Genesis 18:10-14
Then he said, "I will certainly return to you when the season comes round. Behold, Sarah your wife will have a son." Sarah heard in the tent door, which was behind him.
Genesis 21:1-2
The LORD visited Sarah as he had said, and the LORD did to Sarah as he had spoken.
Romans 9:7-8
Neither, because they are Abraham's seed, are they all children. But, "In Isaac will your seed be called."
Genesis 17:15-19
God said to Abraham, "As for Sarai your wife, you shall not call her name Sarai, but her name will be Sarah.
Romans 4:18-21
Who in hope believed against hope, to the end that he might become a father of many nations, according to that which had been spoken, "So will 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 proclaim:
Galatians 4:28-29
Now you, brothers, as Isaac was, are children of promise.