It is narrated from Haram bin Sa'd bin Muhaysah (may Allah be pleased with him) that he asked the Prophet (ﷺ) for permission to take wages for cupping, but he (ﷺ) forbade him from taking this wage. After that, he continued to ask and seek permission until the Prophet (ﷺ) said: "You may feed it (the wage) to your water-drawing camel and your slave."
Hadith Referenceمسند الإمام الشافعي / كتاب الأطعمة والصيد والذبائح / 1515