Musnad Ahmad 5:775

'Abdullah narrated to us, Muhammad ibn Aban al-Balkhi narrated to me, 'Abd al-Razzaq narrated to us, Sufyan narrated to us, from Abu Ishaq, from Abu Hayyah ibn Qays, from 'Ali (may Allah be pleased with him): "He performed wudu three times [for each part], then he wiped his head, then he drank the remainder of his wudu water." Then he said: "Whoever is pleased to look at the wudu of the Messenger of Allah (may Allah bless him and grant him peace), then let him look at this."