Ibn Muhaysa Ansari, a member of the clan of Haritha, reported that he asked the Messenger of Allah ﷺ for permission to take the earnings of a cupper, and he forbade him from it. He kept on asking and pressing him for permission until the Prophet said, "Feed it to your water-carriers," meaning your slaves.
و حدثني مالك
عن ابن محيصة الأنصاري أحد بني حارثة أنه استأذن رسول الله ﷺ في إجارة الحجام فنهاه عنها فلم يزل يسأله ويستأذنه حتى قال اعلفه نضاحك يعني رقيقك