(103) بَابُ إِذَا نَصَحَ الْعَبْدُ لِسَيِّدِهِ
'Abdullah ibn 'Umar reported that the Messenger of Allah, may Allahbless him and grant him peace, said, "When the slave advises his masterand is assiduous in the worship of his Lord, he receives a double reward."
Reference: Al-Adab Al-Mufrad 202
In-book reference: Book 9, Hadith 47
English translation: Book 9, Hadith 202