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 1665 a

Abu Huraira reported Allah's Messenger (ﷺ) as saying:

For a faithful slave there are two rewards. By him in Whose hand is the life of Abu Huraira, but for Jihad in the cause of Allah, and Pilgrimage and kindness to my mother, I would have preferred to die as a slave. He (one of the narrators in the chain of transmitters) said: This news reached us that Abu Huraira did not perform Pilgrimage until his mother died for (keeping himself constantly) in her service.
حَدَّثَنِي أَبُو الطَّاهِرِ، وَحَرْمَلَةُ بْنُ يَحْيَى، قَالاَ أَخْبَرَنَا ابْنُ وَهْبٍ، أَخْبَرَنِي يُونُسُ، عَنِ ابْنِ شِهَابٍ، قَالَ سَمِعْتُ سَعِيدَ بْنَ الْمُسَيَّبِ، يَقُولُ قَالَ أَبُو هُرَيْرَةَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم ‏"‏ لِلْعَبْدِ الْمَمْلُوكِ الْمُصْلِحِ أَجْرَانِ ‏"‏ ‏.‏ وَالَّذِي نَفْسُ أَبِي هُرَيْرَةَ بِيَدِهِ لَوْلاَ الْجِهَادُ فِي سَبِيلِ اللَّهِ وَالْحَجُّ وَبِرُّ أُمِّي لأَحْبَبْتُ أَنْ أَمُوتَ وَأَنَا مَمْلُوكٌ ‏.‏ قَالَ وَبَلَغَنَا أَنَّ أَبَا هُرَيْرَةَ لَمْ يَكُنْ يَحُجُّ حَتَّى مَاتَتْ أُمُّهُ لِصُحْبَتِهَا ‏.‏ قَالَ أَبُو الطَّاهِرِ فِي حَدِيثِهِ ‏"‏ لِلْعَبْدِ الْمُصْلِحِ ‏"‏ ‏.‏ وَلَمْ يَذْكُرِ الْمَمْلُوكَ ‏.‏
Reference : Sahih Muslim 1665a
In-book reference : Book 27, Hadith 67
USC-MSA web (English) reference : Book 15, Hadith 4099
  (deprecated numbering scheme)