The Prophet ﷺ was asked about the earnings of the cupper, and he replied, "Feed it to your camel."
أن النبي ﷺ سئل عن كسب الحجام، فقال: اعلفه ناضحك.
Ahmad (14290, 15079) and Abu Yaala (2114) both narrated it from the hadith of Sufyan bin Uyayna, from Abu Zubayr, who heard Jabir say what has already been mentioned. The "nadih" is the camel.