It was narrated that Harith said:
"'Ali called for water, and he washed his hands before putting them in the vessel, then he said: 'This is what I saw the Messenger of Allah doing.'" (RU)
English reference (RU): Vol. 1, Book 1, Hadith 396 (RU)
Arabic reference (RU): Book 1, Hadith 428 (RU)