Hazrat Anas (may Allah be pleased with him) narrates that I was with some children when the Noble Prophet (peace and blessings be upon him) passed by us and he greeted us with salam. Then the Prophet (peace and blessings be upon him) sent me for some task and sat in the shade of a wall until I returned to him. I informed him about that task. Then when I came to Hazrat Umm Sulaym, she asked: What kept you today? I said that the Noble Prophet (peace and blessings be upon him) had sent me for some task. She asked: What was the task? I said: Indeed, it is the secret of the Messenger of Allah (peace and blessings be upon him). She said: Guard the secret of the Messenger of Allah (peace and blessings be upon him). Hazrat Anas (may Allah be pleased with him) says: I did not tell anyone about it.