Ibn Muhayyisah narrates from his father (may Allah be pleased with him) that he sought permission from the Messenger of Allah (peace and blessings be upon him) concerning the earnings of the cupper, and he (peace and blessings be upon him) forbade it. He kept asking until he (peace and blessings be upon him) said: "Give fodder to your camel and provide food for your slave."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الضحايا / 19507