It is narrated from Sayyiduna Ibn Mas'ud (may Allah be pleased with him) that the Prophet (peace and blessings of Allah be upon him) taught me Surah Ahqaf and also taught it to another man. That man differed with me regarding one verse. I asked him, "Who taught you this Surah?" He said, "The Prophet (peace and blessings of Allah be upon him) did." I said, "The Prophet (peace and blessings of Allah be upon him) taught it to me in such and such a way." Then I went to the Prophet (peace and blessings of Allah be upon him) and said, "O Messenger of Allah (peace and blessings of Allah be upon him)! Did you not teach me in such and such a way?" The Prophet (peace and blessings of Allah be upon him) said, "Yes, indeed." The other man also asked the same, and the Prophet (peace and blessings of Allah be upon him) gave him the same answer. At that time, a man was sitting with the Prophet (peace and blessings of Allah be upon him), and he said, "Each of you should recite as he has heard, because those before you were destroyed due to their disagreements." I do not know whether the Prophet (peace and blessings of Allah be upon him) said this or the man said it from himself.