"Allah has made some of your brothers as slaves under your care. So whoever has his brother under his care, then let him feed him from his food, and let him clothe him from his clothes. And do not give him a duty that he cannot bear, and if you give him a duty he cannot bear, then assist him with it."  

قَالَ رَسُولُ اللَّهِ ﷺ إِخْوَانُكُمْ جَعَلَهُمُ اللَّهُ فِتْيَةً تَحْتَ أَيْدِيكُمْ فَمَنْ كَانَ أَخُوهُ تَحْتَ يَدِهِ فَلْيُطْعِمْهُ مِنْ طَعَامِهِ وَلْيُلْبِسْهُ مِنْ لِبَاسِهِ وَلاَ يُكَلِّفْهُ مَا يَغْلِبُهُ فَإِنْ كَلَّفَهُ مَا يَغْلِبُهُ فَلْيُعِنْهُ قَالَ وَفِي الْبَابِ عَنْ عَلِيٍّ وَأُمِّ سَلَمَةَ وَابْنِ عُمَرَ وَأَبِي هُرَيْرَةَ  

"The one who treats his slaves badly will not enter paradise."  

عَنِ النَّبِيِّ ﷺ قَالَ لاَ يَدْخُلُ الْجَنَّةَ سَيِّئُ الْمَلَكَةِ