Musnad Ahmad 5:565

Abdullah narrated to us, Abu Hafs ‘Amr ibn ‘Ali narrated to me, Abu Dawud narrated to us, Warqa’ informed me, from ‘Abd al-A‘la, from Abu Jamilah, from ‘Ali: "The Messenger of Allah (peace and blessings of Allah be upon him) was cupped and gave the cupper his wage."