Abu Dawud
Purification (Kitab Al-Taharah)
Book Number: 001 / Hadith Number: 109
Narated By Abu 'Alqamah : 'Uthman called for water and performed ablution. He then poured water with the right hand or the left hand; he then washed them upto the wrist; he rinsed the mouth and snuffed up water three times. The narrator mentioned that 'Uthman washed each part three times. He then wiped head and washed his feet. He said: I saw the Apostle of Allah (pbuh) performing ablution as you saw me perform ablution. He the reported the tradition like that of al-Zuhri and completed it.