Virtues of the Qur'an
Bukhari :: Book 6 :: Volume 61 :: Hadith 582
That he heard a man reciting a Quranic Verse which he had heard the Prophet reciting in a different way. So he took that man to the Prophet (and told him the story). The Prophet said, "Both of you are reciting in a correct way, so carry on reciting." The Prophet further added, "The nations which were before you were destroyed (by Allah) because they differed."
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