Abdullah bin Umar reported the Messenger of Allah ﷺ as saying: when a slave acts sincerely towards his master and worship Allah well, he will have a double reward.
Hadith ReferenceSunan Abi Dawud / (Abwab Un Noam ) / Hadith: 5169
Hadith Gradingالألبانی:صحيح | زبیر علی زئی:صحيح بخاري (2546) صحيح مسلم (1664)