Sahih Muslim
The Book on General Behaviour (Kitab Al-Adab)
Book Number: 025 / Hadith Number: 5327
Samura b. Jundub reported: Allah's Messenger (may peace be upon him) forbade us to give names to our servants as these four names: Aflah (Successful), Rabdh (Profit), Yasar (Wealth), and Nafi' (Beneficial).