Sunan An-Nasai, Chapter: The Book of Purification

"I saw the Messenger of Allah (saw) performing Wudu. He washed his hands, then he rinsed his mouth and nose with one handful of water, washed his face, washed each hand once, and wiped his head and ears once." (One of the narrators) Abdul-Aziz said: "Someone who heard from Ibn Ajlan told me that he said concerning that: 'And he washed his feet.'" (Hasan)