Messenger of Allah ﷺ said, "If a slave is honest and faithful to his master and worships his Lord (Allah) in a perfect manner, he will get a double reward." (Using translation from Bukhārī 2546)
"إنَّ الْعَبْدَ إِذَا نَصَحَ لسَيِّدهِ وَأحْسَنَ عِبَادَةَ رَبِّهِ، كَانَ لَهُ أجْرُهُ مرَّتين".