(103) بَابُ إِذَا نَصَحَ الْعَبْدُ لِسَيِّدِهِ
Abu Burda reported from his father that the Messenger of Allah,may Allah bless him and grant him peace, said, "The slave has two rewardswhen he carries out Allah's due in worship (or he said that he is excellentin his worship) and the right of his owner who owns him."
Reference: Al-Adab Al-Mufrad 205
In-book reference: Book 9, Hadith 50
English translation: Book 9, Hadith 205