Sayyiduna Umar (may Allah be pleased with him) narrates that once I heard Hisham bin Hakeem reciting Surah Furqan in prayer. He was reciting such words in it that the Prophet (peace and blessings be upon him) had not taught me. I caught hold of his hand and brought him to the Prophet (peace and blessings be upon him) and said: O Messenger of Allah! You yourself taught me Surah Furqan, and I have heard him reciting it in such words which you did not teach me? The Prophet (peace and blessings be upon him) told Hisham to recite it. He recited it in the same way as I had heard him. The Prophet (peace and blessings be upon him) said: "This Surah has been revealed in this way." Then he said to me: Umar! You also recite. So I recited it. The Prophet (peace and blessings be upon him) said: "It has been revealed in this way also." After that, he said: "Indeed, this Qur'an has been revealed upon seven modes of recitation, so recite in whichever is easy for you."