(40) باب اسْتِعْمَالِ فَضْلِ وَضُوءِ النَّاسِ
Abu Musa said:
The Prophet asked for a tumbler containing water and washed both his hands and face in it and then threw a mouthful of water in the tumbler and said to both of us (Abu Musa and Bilal), "Drink from the tumbler and pour some of its water on your faces and chests."
Reference: Sahih al-Bukhari 188
In-book reference: Book 4, Hadith 54
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 1, Book 4, Hadith 187