Compiled by Imam Yahya ibn Sharaf al-Nawawi
وعن أبي موسى الأشعري قال: قال رسول الله صلى الله عليه وسلم : "المملوك الذي يحسن عبادة ربه ويؤدي إلى سيده الذي عليه من الحق، والنصيحة والطاعة له أجران" ((رواه البخاري)).
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].