كتاب الأيمان
27  
The Book of Oaths
(11)
Chapter: The reward of a slave who is sincere towards his master and worships Allah properly
(11)
باب ثَوَابِ الْعَبْدِ وَأَجْرِهِ إِذَا نَصَحَ لِسَيِّدِهِ وَأَحْسَنَ عِبَادَةَ اللَّهِ ‏‏
Sahih Muslim 1666 b
The above hadith has been reported through another chain of transmitters on the authority of Abu Huraira.
وَحَدَّثَنِيهِ زُهَيْرُ بْنُ حَرْبٍ، حَدَّثَنَا جَرِيرٌ، عَنِ الأَعْمَشِ، بِهَذَا الإِسْنَادِ ‏.‏
Reference : Sahih Muslim 1666b
In-book reference : Book 27, Hadith 70
USC-MSA web (English) reference : Book 15, Hadith 4100
  (deprecated numbering scheme)