TSK · Genesis 17:19

The angel of Yahweh said to her, "Behold, you are with child, and will bear a son. You shall call his name Ishmael, because Yahweh has heard your affliction.

He said, "I will certainly return to you when the season comes round. Behold, Sarah your wife will have a son." Sarah heard in the tent door, which was behind him.

Abraham called his son who was born to him, whom Sarah bore to him, Isaac.

Live in this land, and I will be with you, and will bless you. For to you, and to your seed, I will give all these lands, and I will establish the oath which I swore to Abraham your father.

But the angel said to him, "Don't be afraid, Zacharias, because your request has been heard, and your wife, Elizabeth, will bear you a son, and you shall call his name John.

Now we, brothers, as Isaac was, are children of promise.