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.'" (JA)
English reference (JA): Vol. 1, Book 1, Hadith 396 (JA)
Arabic reference (JA): Book 1, Hadith 428 (JA)