Lady Umm Ayub (may Allah be pleased with her) narrated from the Messenger of Allah (peace and blessings be upon him) that he said: "The Qur'an has been revealed upon seven recitations; all of them are satisfactory and sufficient."
Hadith Referenceمسند اسحاق بن راهويه / كتاب الصلوٰة / 184
Hadith Takhrij«بخاري ، مسلم ، كتاب صلاة المسافرين ، باب بيان القرآن على سبعة احراف الخ ، رقم : 819 . سنن ابوداود ، رقم : 1475 . سنن ترمذي ، رقم : 2943 . سنن نسائي ، رقم : 940 .»
Explanation & Benefits
Hafiz Abdush Shakoor Tirmidhi
Benefits: This is a kind of facilitation from Allah, the Lord of Might and Majesty, for those who have faith in the Qur’an: that they may recite the Qur’an in any of the recitations (qira’at), and Allah will not deprive them of reward, as long as those recitations are mutawatir (mass-transmitted).