ENOfficial
Abu Musa reported that the Messenger of Allah, may Allah bless him and grant him peace, said, "The slave who is excellent in the worship of his Lord and fulfils the duties of obedience and counsel which he owes to his master, has two rewards."
Source: sunnah.com
Other translations
Arabic
حَدَّثَنَا مُحَمَّدُ بْنُ الْعَلاَءِ، قَالَ: حَدَّثَنَا أَبُو أُسَامَةَ، عَنْ بُرَيْدِ بْنِ عَبْدِ اللهِ، عَنْ أَبِي بُرْدَةَ، عَنْ أَبِي مُوسَى قَالَ: قَالَ رَسُولُ اللهِ صلى الله عليه وسلم: الْمَمْلُوكُ الَّذِي يُحْسِنُ عِبَادَةَ رَبِّهِ، وَيُؤَدِّي إِلَى سَيِّدِهِ الَّذِي فُرِضَ، الطَّاعَةُ وَالنَّصِيحَةُ، لَهُ أَجْرَانِ.
sunnah.com