Malik related to me from Ibn Shihab from Ibn Muhayyisa al-Ansari,
one of the Banu Haritha, that he asked permission from the Messenger
of Allah, may Allah bless him and grant him peace, to give payment for
cupping, and he forbade him to do it. He continued to ask and seek his
permission until he said, "Feed the ones who drive your water-carrying
camels," meaning "your slaves."
Muwatta Malik Book 54, Hadith 28