Galatians 4:23
But he who was of the bond-woman, was born according to the flesh; but he of the free-woman was by promise.
Hebrews 11:11
Through faith also Sarah herself received strength to conceive seed, and was delivered of a child when she was past age, because she judged him faithful who had promised.
Genesis 18:10-14
And he said, I will certainly return to thee according to the time of life; and lo, Sarah thy wife shall have a son. And Sarah heard it in the tent door, which was behind him.
Genesis 21:1-2
And 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 the seed of Abraham, are they all children: but, In Isaac shall thy seed be called.
Genesis 17:15-19
And God said to Abraham, As for Sarai thy wife, thou shalt not call her name Sarai, but Sarah shall her name be.
Romans 4:18-21
Who against hope believed with hope, that he should become the father of many nations; according to that which was spoken, So shall thy seed be.
Romans 10:8
But what saith it? The word is nigh thee, even in thy mouth, and in thy heart: that is, the word of faith, which we preach:
Galatians 4:28-29
Now we, brethren, as Isaac was, are the children of promise.