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My interpretation of the passages mentioned from Genesis (though others may read it different) is that Ishmael was greatly loved by his father and until Sarah gave birth to a son, he was the most important child, but he needed to have his first wifes child become the 'sucessor'. But I think he struggled with this and thats why God had to reasure him that Ishmael was still significant and looked after.
I agree, for christians it is pretty clear in the bible that Issac was the 'child of promise', because of this passage in Genesis:
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19And God said, Sarah thy wife shall bear thee a son indeed; and thou shalt call his name Isaac: and I will establish my covenant with him for an everlasting covenant, and with his seed after him.
20And 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. 21But my covenant will I establish with Isaac, which Sarah shall bear unto thee at this set time in the next year.
So Muslims believe it was actually Ishmael? Can someone tell me how this story is written differently in the Quran (sp?) to portray the different beliefs (i.e. which child was actually the child of promise). Interested to know what it says differently. Thanks guys!