It is narrated from Hazrat Aisha (may Allah be pleased with her) that once the Prophet (peace and blessings be upon him) went out from my place very happy and cheerful, but after a short while he returned and was sad. I said, "O Messenger of Allah! When you left my place, you were happy and cheerful, and now you have returned sad." He replied, "I had entered the Ka'bah, then I thought that I should not have done so because I fear that in this way I may have put my Ummah into hardship after me."