Genesis 18:10
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 21:2
And Sarah conceived and bore Abraham a son in his old age at the time of which God had spoken to him.
Genesis 17:21
But I will establish my covenant with Isaac, whom Sarah shall bear to you at this time next year."
Genesis 17:19
God said, "No, but Sarah your wife shall bear you a son, and you shall call his name Isaac. I will establish my covenant with him as an everlasting covenant for his offspring after him.
Genesis 16:10
The angel of the LORD also said to her, "I will surely multiply your offspring so that they cannot be numbered for multitude."
Genesis 17:16
I will bless her, and moreover, I will give you a son by her. I will bless her, and she shall become nations; kings of peoples shall come from her."
Genesis 18:13-14
The LORD said to Abraham, "Why did Sarah laugh and say, 'Shall I indeed bear a child, now that I am old?'
Genesis 22:15-16
And the angel of the LORD called to Abraham a second time from heaven
Judges 13:3-5
And the angel of the LORD appeared to the woman and said to her, "Behold, you are barren and have not borne children, but you shall conceive and bear a son.
2 Kings 4:16-17
And he said, "At this season, about this time next year, you shall embrace a son." And she said, "No, my lord, O man of God; do not lie to your servant."
Luke 1:13
But the angel said to him, "Do not be afraid, Zechariah, for your prayer has been heard, and your wife Elizabeth will bear you a son, and you shall call his name John.
Romans 9:8-9
This means that it is not the children of the flesh who are the children of God, but the children of the promise are counted as offspring.
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.
Galatians 4:28
Now you, brothers, like Isaac, are children of promise.