وَحَدَّثَنِي مَالِكٌ، عَنِ ابْنِ شِهَابٍ، عَنِ ابْنِ مُحَيِّصَةَ الأَنْصَارِيِّ، أَحَدِ بَنِي حَارِثَةَ أَنَّهُ اسْتَأْذَنَ رَسُولَ اللَّهِ صلى الله عليه وسلم فِي إِجَارَةِ الْحَجَّامِ فَنَهَاهُ عَنْهَا فَلَمْ يَزَلْ يَسْأَلُهُ وَيَسْتَأْذِنُهُ حَتَّى قَالَ ‏"‏ اعْلِفْهُ نُضَّاحَكَ ‏"‏ ‏.‏ يَعْنِي رَقِيقَكَ ‏.‏

Malik related to me from Ibn Shihab from Ibn Muhayyisa al-Ansari,one of the Banu Haritha, that he asked permission from the Messengerof Allah, may Allah bless him and grant him peace, to give payment forcupping, and he forbade him to do it. He continued to ask and seek hispermission until he said, "Feed the ones who drive your water-carryingcamels," meaning "your slaves." Translation Not Available

Book Ref: Muwatta Imam Malik Book 54 Hadith 1793
Web Ref:  Muwatta Imam Malik Book 54 Hadith 28