Pilgrimmage (Hajj)
Bukhari :: Book 2 :: Volume 26 :: Hadith 652
Narrated Jabir bin 'Abdullah:
When the Ka'ba was built, the Prophet and Abbas went to bring stones (for its construction). Al Abbas said to the Prophet, "Take off your waist sheet and put it on your neck." (When the Prophet took it off) he fell on the ground with his eyes open towards the sky and said, "Give me my waist sheet." And he covered himself with it.