Sahih al-Bukhari, Book 49, Hadith 33 (In-Book) ⓘ
Narrated Abu Huraira: The Prophet said, "Goodness and comfort are for him who worships his Lord in a perfect manner and serves his master sincerely."
حَدَّثَنَا إِسْحَاقُ بْنُ نَصْرٍ، حَدَّثَنَا أَبُو أُسَامَةَ، عَنِ الأَعْمَشِ، حَدَّثَنَا أَبُو صَالِحٍ، عَنْ أَبِي هُرَيْرَةَ ـ رضى الله عنه ـ قَالَ قَالَ النَّبِيُّ صلى الله عليه وسلم " نِعْمَ مَا لأَحَدِهِمْ يُحْسِنُ عِبَادَةَ رَبِّهِ وَيَنْصَحُ لِسَيِّدِهِ " .
also referenced under: Hadith 2549 (DarusSalam) & Volume 3, Book 46, Hadith 725 (USC-MSA)