Musannaf Ibn Abi Shaybah

Hazrat Abd Khair narrates that once during the Fajr prayer we were with Hazrat Ali (may Allah be pleased with him). When he finished the prayer with salam, he asked a servant to bring a basin of water and performed ablution with it. During ablution, he inserted his fingers into his ears and then said, "I saw the Messenger of Allah (peace and blessings be upon him) perform ablution in this manner."