It is common to hear from Muslims that the Bible is corrupt and there is one perfect Qur’an. How should a Christian answer this? Regarding the Bible, we have ample evidence from the ancient manuscripts, ancient translations, and ancient quotations, that the Bible has been well preserved. Regarding the Qur’an, it is simply not true that there is only one Qur’an. There are different Arabic Qur’ans in use around the world today, and there are variants among the manuscripts and quotation. These two references give the details.
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https://www.answering-islam.org/Green/seven.htm