It is narrated from Sayyida Aisha (may Allah be pleased with her), she says: When the Noble Prophet (peace and blessings be upon him) left from me, there was calmness in his eyes and he was in a very pleasant mood, but when he returned, the Prophet (peace and blessings be upon him) was sorrowful. I said: O Messenger of Allah! When you left from me, there was delight in your eyes and your temperament was pleasant, but now you have returned sorrowful? The Prophet (peace and blessings be upon him) said: I am afraid that after me, I have imposed upon my Ummah a task that will tire them.