Sayyiduna Ali (may Allah be pleased with him) narrates: A man came to the service of the Prophet Muhammad (peace and blessings be upon him) and asked: "Should I recite (Qur'an) behind the Imam or should I remain silent?" The Prophet Muhammad (peace and blessings be upon him) said: "You should remain silent, that will be sufficient for you." In narrating this tradition, the narrator named Ghassan is unique, and he is weak, while the other two narrators of this narration, Qais and Muhammad bin Salim, are also weak. The previously mentioned 'mursal' narration is more authentic than this. And Allah knows best.