You are a person who has remnants of the ignorant pre-Islamic manners. Your slaves are your brothers and servants whom Allah has placed under your authority. He who has his brother under his authority should feed him from whatever he eats, dress him with whatever he wears, and not assign burdensome and difficult tasks to them that are beyond their capacity. If you do this then help them

Al-Ma‘rūr ibn Suwayd reported: I saw Abu Tharr (may Allah be pleased with him) wearing a nice clothes, and his slave was wearing a similarly nice clothes also. I asked him about this and he said that he had exchanged harsh words with a person during the lifetime of the Messenger of Allah (may Allah's peace and blessings be upon him) and insulted him by making an offensive reference to his mother. That person came to the Messenger of Allah (may Allah's peace and blessings be upon him) and made mention of that (abuse) to him. Then the Messenger of Allah (may Allah's peace and blessings be upon him) said: "You are a person who has remnants of the ignorant pre-Islamic manners. Your slaves are your brothers and servants whom Allah has placed under your authority. He who has his brother under his authority should feed him from whatever he eats, dress him with whatever he wears, and not assign burdensome and difficult tasks to them that are beyond their capacity. If you do this then help them."