Masruq (may Allah have mercy on him) says that once Sayyiduna Ibn Amr (may Allah be pleased with him) began mentioning Sayyiduna Ibn Mas'ud (may Allah be pleased with him) and said: "He is such a man whom I will always love. I heard the Noble Prophet (peace and blessings be upon him) say: 'Learn the Qur'an from four people,' and he first mentioned the name of Sayyiduna Ibn Mas'ud (may Allah be pleased with him), then Sayyiduna Ubayy ibn Ka'b (may Allah be pleased with him), then Sayyiduna Mu'adh ibn Jabal (may Allah be pleased with him), then Salim (may Allah be pleased with him), the freed slave of Abu Hudhayfah (may Allah be pleased with him)."