Virtues of the Qur'an
Bukhari :: Book 6 :: Volume 61 :: Hadith 521
'Abdullah bin 'Amr mentioned 'Abdullah bin Masud and said, "I shall ever love that man, for I heard the Prophet saying, 'Take (learn) the Qur'an from four: 'Abdullah bin Masud, Salim, Mu'adh and Ubai bin Ka'b.' "
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