Galatians 4:23
Yea, and he which was of the bondwoman, was born after the flesh: but he which was of the freewoman, was born by promise.
Hebrews 11:11
Through faith Sarah also received strength to be with child, and was delivered of a child when she was past age, because she judged him faithful which had promised.
Genesis 18:10-14
And he said, "I will come again unto thee as soon as the fruit can live. And lo, Sara thy wife shall have a son." That heard Sara, out of the tent door which was behind his back.
Genesis 21:1-2
The LORD visited Sara as he had said, and did unto her according as he had spoken.
Romans 9:7-8
Neither are they all children straightway because they are the seed of Abraham: But in Isaac shall thy seed be called,
Genesis 17:15-19
And God said unto Abraham, "Sarai, thy wife, shall no more be called Sarai: but Sara shall her name be.
Romans 4:18-21
Which Abraham, contrary to hope, believed in hope: that he should be the father of many nations, according to that which was spoken, "So shall thy seed be."
Romans 10:8
But what saith the scripture? "The word is nigh thee, even in thy mouth and in thine heart." This word is the word of faith which we preach.
Galatians 4:28-29
Brethren, we are, after the manner of Isaac, children of promise: