Sallam ibn 'Amr reported from one of the Companions of the Prophet, may Allah bless him and grant him peace, said, "Your slaves are your brothers, so treat him well. Ask for their help in what is too much for you and help them in what is too much for them."  

عَنْ رَجُلٍ مِنْ أَصْحَابِ النَّبِيِّ ﷺ قَالَ قَالَ النَّبِيُّ ﷺ أَرِقَّاكُمْ إِخْوَانُكُمْ فَأَحْسِنُوا إِلَيْهِمْ اسْتَعِينُوهُمْ عَلَى مَا غَلَبَكُمْ وَأَعِينُوهُمْ عَلَى مَا غُلِبُوا  

Abu Hurayra said, 'Help the worker in his work. The one who works for Allah will not be disappointed," i.e. the servant.  

أَنَّهُ قَالَ أَعِينُوا الْعَامِلَ مِنْ عَمَلِهِ فَإِنَّ عَامِلَ اللهِ لاَ يَخِيبُ يَعْنِي الْخَادِمَ