Musannaf Ibn Abi Shayba 1:60

Waki’ narrated to us, from Hassan bin ‘Uqbah al-Muradi, Abu Bakran, that he said: I heard ‘Abd Khayr al-Hamdani saying: ‘Ali said: "Shall I not show you the ablution of the Messenger of Allah, may Allah bless him and grant him peace?" Then he performed ablution three times, three times.