Genesis 17:19-21
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19But God said, “No, but your wife Sarah will bear you a son, and you shall name him Isaac; and I will establish My covenant with him as an everlasting covenant for his descendants after him. 20As for Ishmael, I have heard you; behold, I will bless him, and make him fruitful and multiply him exceedingly. He shall father twelve princes, and I will make him into a great nation. 21But I will establish My covenant with Isaac, whom Sarah will bear to you at this season next year.”