~ Beware! It's Not only about Moosa a.s, but Prophet Muhammad (sallallahu alaihi wa sallam) too..~ Narrated Jabir bin Abdullah : While Allah's Messenger was carrying stones along with the people of Makkah for (building of) Kaaba wearing an Izar (waist sheet cover), his uncle Abbas said to him " O my nephew ! (it would be better) if you take off your Izar and put it over your shoulders underneath the stones " . So he took off his Izar and put it over his shoulders, but he fell down unconscious and since then he had never been seen naked (after that day) [ Bukhari, 1/82 # 364, Muslim, 1/286 # 77(340)] Different versions : "... He fell on the ground with his eyes (open) towards the sky and said " give me my Izar " and he covered himself with it. [ Bukhari, 2/146 # 1582 ] .. " when he woke up, he said ' my Izar, my Izar.! Then his Izar was tied upon him.." [ Bukhari, 5/41 # 3829 ; Muslim, 1/267 # 76(340)] - Some narrations says ...