Genesis 18:10
One of them said, "I will surely return to you when the season comes round again, and your wife Sarah will have a son!" (Now Sarah was listening at the entrance to the tent, not far behind him.
Genesis 21:2
So Sarah became pregnant and bore Abraham a son in his old age at the appointed time that God had told him.
Genesis 17:21
But I will establish my covenant with Isaac, whom Sarah will bear to you at this set time next year."
Genesis 17:19
God said, "No, Sarah your wife is going to bear you a son, and you will name him Isaac. I will confirm my covenant with him as a perpetual covenant for his descendants after him.
Genesis 16:10
I will greatly multiply your descendants," the Lord's angel added, "so that they will be too numerous to count."
Genesis 17:16
I will bless her and will give you a son through her. I will bless her and she will become a mother of nations. Kings of countries will come from her!"
Genesis 18:13-14
The Lord said to Abraham, "Why did Sarah laugh and say, 'Will I really have a child when I am old?'
Genesis 22:15-16
The Lord's angel called to Abraham a second time from heaven
Judges 13:3-5
The Lord's angelic messenger appeared to the woman and said to her, "You are infertile and childless, but you will conceive and have a son.
2 Kings 4:16-17
He said, "About this time next year you will be holding a son." She said, "No, my master! O prophet, 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; you will name him John.
Romans 9:8-9
This means it is not the children of the flesh who are the children of God; rather, the children of promise are counted as descendants.
Galatians 4:23
But one, the son by the slave woman, was born by natural descent, while the other, the son by the free woman, was born through the promise.
Galatians 4:28
But you, brothers and sisters, are children of the promise like Isaac.