Abu Musa Al-Ash'ari (May Allah be pleased with him) reported:
The Messenger of Allah ﷺ said, "A slave who worships his Rubb (Allah) well and discharges efficiently and faithfully the duties which are assigned to him by his master, will have a double reward."

[Al-Bukhari].

وعن أبي موسى الأشعري قال: قال رسول الله ﷺ : "المملوك الذي يحسن عبادة ربه ويؤدي إلى سيده الذي عليه من الحق، والنصيحة والطاعة له أجران" ((رواه البخاري)).