Sunan An-Nasai, Chapter: The Book of Purification

It was narrated that Abu Hayyah - Ibn Qais - said: "I saw Ali perform Wudu. He washed his hands until they looked clean, then he rinsed his mouth three times and his nose three times, and he washed his face three times, and he washed each forearm three times. Then he wiped his head, then he washed his feet up to the ankles. Then he stood up, took the leftover water for his standing. Then he said: 'I wanted to show you how the Prophet (saw) performed Wudu.'" (Sahih)