Al-Adab Al-Mufrad #202
Being a master
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
حَدَّثَنَا إِسْمَاعِيلُ قَالَ: حَدَّثَنِي مَالِكٌ، عَنْ نَافِعٍ، عَنْ عَبْدِ اللهِ بْنِ عُمَرَ، أَنَّ رَسُولَ اللهِ صلى الله عليه وسلم قَالَ: إِنَّ الْعَبْدَ إِذَا نَصَحَ لِسَيِّدِهِ، وَأَحْسَنَ عِبَادَةَ رَبِّهِ، لَهُ أَجْرُهُ مَرَّتَيْنِ.
'Abdullah ibn 'Umar reported that the Messenger of Allah, may Allah
bless him and grant him peace, said, "When the slave advises his master
and is assiduous in the worship of his Lord, he receives a double reward."
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About Al-Adab Al-Mufrad
This hadith is #202 from Al-Adab Al-Mufrad, in the Book of Being a master.