Not graded
Al-Adab al-Mufrad 190
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.
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."
Cited in Al-Adab al-Mufrad (No. 190).