Sunan an-Nasa'i 96

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 each forearm three times. Then he wiped his head, then he washed his feet up to the ankles. Then he stood up, took the left over water for his Wudu' and drank from it while standing. Then he said: 'I wanted to show you how the Prophet (ﷺ) performed Wudu