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Muhammad had frequently dictated to during his lifetime and who prepared a final authorized text of the Koran and completed it in 651, long after Muhammad had died
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I can also say that the Koran is not the word of God
this is your own opinion only

so it is easy for u to challenge quran

so

can u give us sura like an one in quran

that is the true challenge

can u ?l

if not >>>> don't lose our time

your failed in challenge is clear to us bec. u didn't give us an example for your challenge only u make an different between your Forgeries old Testament &our true quran