Genesis 17:19-21

JPS_ASV_Byz(i) 19 And God said: "Nay, but Sarah thy wife shall bear thee a son; and thou shalt call his name Isaac; and I will establish My covenant with him for an everlasting covenant for his seed after him. 20 And as for Ishmael, I have heard thee; behold, I have blessed him, and will make him fruitful, and will multiply him exceedingly; twelve princes shall he beget, and I will make him a great nation. 21 But My covenant will I establish with Isaac, whom Sarah shall bear unto thee at this set time in the next year.'