Sahih Muslim Book 31, Hadith Number 6027.
Chapter : The merits of ‘Abdullah b. Mas’ud and that of his mother (Allah be pleased with them).
Masruq reported: They made a mention of Ibn Mas’ud before ‘Abdullah b. Amr, whereupon he said: He is a person whose love is always fresh in my heart after I heard Allah’s Messenger (may peace be upon him) as saying: Learn the recitation of the Qur’an from four persons: from Ibn Mas’ud, Salim, the ally of Abu Hudhaifa, Ubayy b. Ka’b, Mu’adh b. Jabal.