Narrated Ibn Mas`ud: I heard a person reciting a (Qur'anic) Verse in a certain way, and I had heard the Prophet reciting the same Verse in a different way. So I took him to the Prophet and informed him of that but I noticed the sign of disapproval on his face, and then he said, "Both of you are correct, so don't differ, for the nations before you differed, so they were destroyed."

Narrated `Abdullah: I heard a man reciting a verse (of the Holy Qur'an) but I had heard the Prophet reciting it differently. So, I caught hold of the man by the hand and took him to Allah's Apostle who said, "Both of you are right." Shu`ba, the sub-narrator said, "I think he said to them, "Don't differ, for the nations before you differed and perished (because of their differences). "

Narrated `Abdullah: 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."