Sayyiduna Muhayyisah bin Mas'ud al-Ansari (may Allah be pleased with him) had a slave who was a cupper, named Nafi'. He asked the Messenger of Allah (peace and blessings be upon him) about his earnings, and he (peace and blessings be upon him) said: "Do not even go near it." He put the matter to the Messenger of Allah (peace and blessings be upon him) again, and he (peace and blessings be upon him) said: "Feed your camel with it and put it into its belly."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الضحايا / 19508