Musnad Ahmad 5:706

Abu Ahmad narrated to us, Sufyan narrated to us, from Abu Ishaq, from Abu Hayyah ibn Qays, who said: "Ali performed ablution (wudu) three times by three times, then he drank the remainder of his ablution water." Then he said: "This is how I saw the Messenger of Allah, may Allah bless him and grant him peace, perform ablution."