Masruq says: We mentioned Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him) in the presence of Sayyiduna Abdullah bin Amr (may Allah be pleased with them both), and Sayyiduna Abdullah bin Amr (may Allah be pleased with them both) said: That is a man whom I will always love, after something I heard from the Messenger of Allah (peace and blessings be upon him). He (peace and blessings be upon him) said: "Learn the Qur'an from four people: from Ibn Umm Abd" (and he (peace and blessings be upon him) began with him) "and from Ubayy bin Ka'b, and from Salim the freed slave of Abu Hudhayfah, and from Mu'adh bin Jabal."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 8378
It is narrated from Sayyiduna Abdullah bin Amr (may Allah be pleased with them both) that the Messenger of Allah (peace and blessings be upon him) said: "Learn the Qur'an from these four: Ubayy bin Ka'b, Mu'adh bin Jabal, Abdullah bin Mas'ud, and Salim the freed slave of Abu Hudhayfah."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 8379
Sayyiduna Abdullah bin Amr (may Allah be pleased with them both) says: I heard the Messenger of Allah (peace and blessings be upon him) say: "Learn the Qur'an from four: from Abdullah bin Mas'ud" (and he (peace and blessings be upon him) began with him) "and from Ubayy bin Ka'b, Mu'adh bin Jabal, and Salim the freed slave of Abu Hudhayfah."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 8380