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Others see this as having a much wider purpose, Abraham teaching the world by example about righteousness and devotion to God, especially considering the fact that he had a three days “cooling off period” in which he could have changed his mind but he did not. This was a dramatic act that educated the world about God and how much one must love him. When the angel states “Now I know that you are a God fearing man”, it is interpreted as if he said ‘now I have made known to everyone that you are God fearing’.
A Midrashic story, well known to Jewish children, relates that when non-believers came to Abraham’s tent they were persuaded to thank God for the food. On the surface this was simply about hospitality rather than converting others. In a parallel story within an Islamic tradition, Abraham once refused to feed an idol worshipper, God then reprimands Abaham by asking how old the traveller was. Then pointing out that all these years God himself was happily sustaining this idol worshipper yet Abaham could not bear him for a few moments. http://books.google.com.au/books?id=bRuxQ5eokLEC&pg=PA103&lpg=PA103&dq=Abraham+Hospitality+Islam&source=bl&ots=c1RmXEt34e&sig=m7NzxytzmaFFWerdciqMqJB_Mdk&hl=en&ei=8Fa4TvmNL5SlsALo-amDBA&sa=X&oi=book_result&ct=result&resnum=4&sqi=2&ved=0CCwQ6AEwAw#v=onepage&q&f=false