The does anyone have examples (preferably Muslim documents) that show that the earlier and later traditions are different? Also, I believe I heard from a former Muslim on the Illumined Heart podcast (love that one) that it was actually in the quran, and that it says IN THE QURAN that Issac was to be sacrificed. I might be wrong on this.
I just looked at the surah in question, and as far as I can tell it speaks of a first son being born, Abraham having his dream, and then an angel stopping him, AND THEN Issac being born.
Unsurprisingly, Muhammad did not give Ishmael’s name when he related the story of Abraham’s sacrifice (Surah 37:102-107) even though most Muslim scholars tend to identify the child whom God asked Abraham to offer as Ishmael rather than Isaac. Traditional Islamic commentaries on this issue are far from accuracy, for Muhammad would have placed Ishmael in the verse below between Abraham and Isaac if he had agreed with the Islamic scholars in regard to the identity of the child mentioned in verses 102-103:
And We blessed him and Isaac. And of their seed are some who do good, and some who plainly wrong themselves. (Surah 37:113 Pickthall)Taken from the appendix of the article entitled "Imran's Fatherhood-Part 2"
http://www.answering-islam.org/authors/masihiyyen/imran_father2.htmlMore, the narrative in Surah 37 says that Abraham attempted to sacrifice his son that was born to him right after his departure from the land of his idolatrous father and folk:
And he said: Lo! I am going unto my Lord Who will guide me. My Lord! Vouchsafe me of the righteous. So We gave him tidings of a gentle son. And when (his son) was old enough to walk with him, (Abraham) said: O my dear son, I have seen in a dream that I must sacrifice thee. So look, what thinkest thou? He said: O my father! Do that which thou art commanded. Allah willing, thou shalt find me of the steadfast. (Surah 37:99-102)
According to Surah 19, this son was not Ishmael, but Isaac:
I shall withdraw from you and that unto which ye pray beside Allah, and I shall pray unto my Lord. It may be that, in prayer unto my Lord, I shall not be unblest. So, when he had withdrawn from them and that which they were worshipping beside Allah, We gave him
Isaac and Jacob. Each of them We made a prophet. (Surah 19:48-49)