كتاب الزكاة
12  
The Book of Zakat
(12)
Chapter: The virtue of spending on one's family and slaves, and the sin of the one who neglects them or withholds maintenance from them
(12)
باب فَضْلِ النَّفَقَةِ عَلَى الْعِيَالِ وَالْمَمْلُوكِ وَإِثْمِ مَنْ ضَيَّعَهُمْ أَوْ حَبَسَ نَفَقَتَهُمْ عَنْهُمْ
Sahih Muslim 996

Khaithama reported:

While we were sitting in the company of 'Abdullah b. 'Umar there came in his steward. He (Ibn 'Umar) said: Have you supplied the provision to the slaves? He said: No. Upon this he said: Go and give (the provision) to them, for the Messenger of Allah (ﷺ) has said: This sin is enough for a man that he withholds the subsistence from one whose master he is.
حَدَّثَنَا سَعِيدُ بْنُ مُحَمَّدٍ الْجَرْمِيُّ، حَدَّثَنَا عَبْدُ الرَّحْمَنِ بْنُ عَبْدِ الْمَلِكِ بْنِ أَبْجَرَ الْكِنَانِيُّ، عَنْ أَبِيهِ، عَنْ طَلْحَةَ بْنِ مُصَرِّفٍ، عَنْ خَيْثَمَةَ، قَالَ كُنَّا جُلُوسًا مَعَ عَبْدِ اللَّهِ بْنِ عَمْرٍو إِذْ جَاءَهُ قَهْرَمَانٌ لَهُ فَدَخَلَ فَقَالَ أَعْطَيْتَ الرَّقِيقَ قُوتَهُمْ قَالَ لاَ ‏.‏ قَالَ فَانْطَلِقْ فَأَعْطِهِمْ ‏.‏ قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم ‏ "‏ كَفَى بِالْمَرْءِ إِثْمًا أَنْ يَحْبِسَ عَمَّنْ يَمْلِكُ قُوتَهُ ‏"‏ ‏.‏
Reference : Sahih Muslim 996
In-book reference : Book 12, Hadith 49
USC-MSA web (English) reference : Book 5, Hadith 2182
  (deprecated numbering scheme)