What was the advice given to Umar (peace be upon him) by the Prophet Muhammad (saw) when Umar (peace be upon him) mentioned that he was Junbi during the night?
 Ibn Umar reported:                      Umar b. al-Khattab said to the Messenger of Allah (may peace be upon him), that he became Junbi during the night. The Messenger of Allah (may peace be upon him) said to him: Perform ablution, wash your sexual organ and then go to sleep.