Hadithcore
Al-Adab Al-Mufrad, 190
da’if· Al-Albani

Sallam ibn 'Amr reported from one of the Companions of the Prophet, (ﷺ), 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."

حَدَّثَنَا آدَمُ، قَالَ‏:‏ حَدَّثَنَا شُعْبَةُ، قَالَ‏:‏ حَدَّثَنَا أَبُو بِشْرٍ قَالَ‏:‏ سَمِعْتُ سَلاَّمَ بْنَ عَمْرٍو يُحَدِّثُ، عَنْ رَجُلٍ مِنْ أَصْحَابِ النَّبِيِّ صلى الله عليه وسلم قَالَ‏:‏ قَالَ النَّبِيُّ صلى الله عليه وسلم‏:‏ أَرِقَّاكُمْ إِخْوَانُكُمْ، فَأَحْسِنُوا إِلَيْهِمْ، اسْتَعِينُوهُمْ عَلَى مَا غَلَبَكُمْ، وَأَعِينُوهُمْ عَلَى مَا غُلِبُوا‏.‏

References2 variants
In-Book Reference
Book 9, Hadith 35
English Reference
Book 9, Hadith 190