God said, "No, but Sarah, your wife, will bear you a son. You shall call his name Isaac. I will establish my covenant with him for an everlasting covenant for his seed after him.
TSK
TSK · Genesis 21:1
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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.
Joseph said to his brothers, "I am dying, but God will surely visit you, and bring you up out of this land to the land which he swore to Abraham, to Isaac, and to Jacob."
The people believed, and when they heard that Yahweh had visited the children of Israel, and that he had seen their affliction, then they bowed their heads and worshiped.
Then she arose with her daughters-in-law, that she might return from the country of Moab: for she had heard in the country of Moab how that Yahweh had visited his people in giving them bread.
The woman conceived, and bore a son at that season, when the time came around, as Elisha had said to her.
Remember me, Yahweh, with the favor that you show to your people. Visit me with your salvation,
"Blessed be the Lord, the God of Israel, for he has visited and worked redemption for his people;
As it is written, "I have made you a father of many nations." This is in the presence of him whom he believed: God, who gives life to the dead, and calls the things that are not, as though they were.
Now we, brothers, as Isaac was, are children of promise.