The Prophet ﷺ said, "The Mamluk (slave) who worships his Lord in a perfect manner, and is dutiful, sincere and obedient to his Saiyid (master), will get a double reward."  

عَنِ النَّبِيِّ ﷺ قَالَ الْمَمْلُوكُ الَّذِي يُحْسِنُ عِبَادَةَ رَبِّهِ وَيُؤَدِّي إِلَى سَيِّدِهِ الَّذِي لَهُ عَلَيْهِ مِنَ الْحَقِّ وَالنَّصِيحَةِ وَالطَّاعَةِ لَهُ أَجْرَانِ  

[Machine] On the authority of the Prophet ﷺ , he said to the servant who excels in worshiping his Lord and fulfills his obligations towards his master, who has rights over him in terms of truthfulness, advice, and obedience, that he will receive two rewards: the reward for his excellent worship of his Lord and the reward for what he fulfills towards his master, who has rights over him.  

عَنِ النَّبِيِّ ﷺ قَالَ لِلْمَمْلُوكِ الَّذِي يُحْسِنُ عِبَادَةَ رَبِّهِ وَيُؤَدِّي إِلَى سَيِّدِهِ الَّذِي لَهُ عَلَيْهِ مِنَ الْحَقِّ وَالنَّصِيحَةِ وَالطَّاعَةِ لَهُ أَجْرَانِ أَجْرُ مَا أَحْسَنَ عِبَادَةَ رَبِّهِ وَأَجْرُ مَا أَدَّى إِلَى مَلِيكِهُ الَّذِي لَهُ عَلَيْهِ مِنَ الْحَقِّ