The Book Pertaining to the Merits of the Companions (Allah Be Pleased With Them) of the Holy Prophet (May Peace Be Upon Him) (Kitab Al-Fada'il Al-Sahabah)
Muslim :: Book 31 : Hadith 6022
'Abdullah (b. Mas'ud) reported that he (said to his companions to conceal their copies of the Qur'an) and further said: He who conceals anything he shall have to bring that which he had concealed on the Day of judgment, and then said: After whose mode of recitation you command me to recite? I in fact recited before AIlah's Messenger (may peace be upon him) more than seventy chapters of the Qur'an and the Companions of Allah's Messenger (may peace be upon him) know it that I have better understanding of the Book of Allah (than they do), and if I were to know that someone had better understanding than I, I would have gone to him. Shaqiq said: I sat in the company of the Companions of Mubkmmad (may peace be upon him) but I did not hear anyone having rejected that (that is, his recitation) or finding fault with it.