Riyad as-SalihinChapter 11Hadith 685
Full Sharh — Riyad as-Salihin 685
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)).
English Translation
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.".
Source
Riyad as-Salihin(رياض الصالحين)
The Book of Jihad
Hadith Number
685