Musnad Ahmad 5:486

Waki’ narrated to us, Isra’il narrated to us, and ‘Abd al-Razzaq narrated to us, Isra’il informed us, from Abu Ishaq, from Abu Hayyah al-Wadi’i. ‘Abd al-Razzaq said: From Abu Hayyah, he said: I saw ‘Ali urinate in the open courtyard (al-Rahbah), then he called for water. He performed ablution (wudu’); he washed his palms three times, rinsed his mouth and sniffed water into his nose three times, washed his face three times, and washed his forearms three times each. He wiped his head, and washed his feet three times each. Then he stood up and drank from the remainder of his ablution water. Then he said: "I saw the Messenger of Allah, peace and blessings of Allah be upon him, do as you have seen me do, and I wanted to show it to you."