Bukhari :: Book 7 :: Volume 72 :: Hadith 750
Narrated Abu Juhaifa:
I came to the Prophet while he was inside a red leather tent, and I saw Bilal taking the remaining water of the ablution of the Prophet, and the people were taking of that water and rubbing it on their faces; and whoever could not get anything of it, would share the moisture of the hand of his companion (and then rub it on his face).
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