Sahih Al Bukhari Hadith Number 2281

Narrated Anas bin Malik: The Prophet (peace be upon him) sent for a slave who had the profession of cupping, and he cupped him. The Prophet (peace be upon him) 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:

37  Hiring
Hadith number 2281
Volume no 3
Chapter: 19 (Whoever appealed to the masters to reduce his taxes)