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 Referenceسنن ابي داود / أبواب النوم / 5169
Hadith Gradingالألبانی:صحيح | زبیر علی زئی:صحيح بخاري (2546) صحيح مسلم (1664)