Sunan An-Nasai, Chapter: The Book of Purification

"The Messenger of Allah (saw) performed Wudu, and he scooped up one handful (of water) and rinsed his mouth and nose. Then he scooped up another handful and washed his face. Then he scooped up another handful and washed his right hand, then another handful and washed his left hand. Then he wiped his head and his ears, the inside with his forefinger and the outside with his thumb. Then he scooped up a handful of water and washed his right foot, and scooped up another handful and washed his left foot." (Hasan)