Musannaf Ibn Abi Shayba 1:511

Ibn Idris and Abu Mu'awiyah narrated to us, from al-A'mash, from 'Abdullah ibn 'Ubaydullah, from Ibn Abi Layla, from al-Bara' ibn 'Azib, who said: The Messenger of Allah, peace and blessings of Allah be upon him, was asked about performing ablution (wudu) after eating camel meat. He said: "Perform ablution from it."