Abu Hurairah Sa'di said: I asked Sayyiduna Hasan bin Ali (may Allah be pleased with them both): What do you remember from the Messenger of Allah (peace and blessings be upon him)? He replied: A man asked the Messenger of Allah (peace and blessings be upon him) about an issue which I do not know. The Messenger of Allah (peace and blessings be upon him) replied: "Leave that which causes you doubt for that which does not cause you doubt."