From Sahih Bukhari (Hadith 2281):
Narrated Anas bin Malik:The Prophet (ﷺ) sent for a slave who had the profession of cupping, and he cupped him. The Prophet (ﷺ) ordered that he be paid one or two Sas, or one or two Mudds of foodstuff, and appealed to his masters to reduce his taxes:
Reference: Bukhari 2281