Abu Dawud
Wages
Book Number: 017 / Hadith Number: 3415
Narated By Muhayyisah ibn Ka'b : Muhayyisah asked permission of the Apostle of Allah (pbuh) regarding hire of the cupper, but he forbade him. He kept on asking his permission, and at last he said to him: Feed your watering camel with it and feed your slave with it.