Galatians 4:23
But the son of the slave was born according to the flesh, while the son of the free woman was born through promise.
Hebrews 11:11
By faith Sarah herself received power to conceive, even when she was past the age, since she considered him faithful who had promised.
Genesis 18:10-14
The LORD said, "I will surely return to you about this time next year, and Sarah your wife shall have a son." And Sarah was listening at the tent door behind him.
Genesis 21:1-2
The LORDvisited Sarah as he had said, and the LORD did to Sarah as he had promised.
Romans 9:7-8
and not all are children of Abraham because they are his offspring, but "Through Isaac shall your offspring be named."
Genesis 17:15-19
And God said to Abraham, "As for Sarai your wife, you shall not call her name Sarai, but Sarah shall be her name.
Romans 4:18-21
In hope he believed against hope, that he should become the father of many nations, as he had been told, "So shall your offspring 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 that we proclaim);
Galatians 4:28-29
Now you, brothers, like Isaac, are children of promise.