Prophet Muhammad on the treatment of slaves
Source: Sunan Ibn Majah, hadiths n° 3690, 3691
'' (The slaves are) your brothers that Allah has placed under your responsibility, so feed them the same food you eat, dress them in the same clothes you wear, and do not overload them so that they are exhausted; if you need to overload them, help them. '' '' No person who mistreats his slave will enter Paradise (...) Be as kind to them as they would be to your own children, and feed them the same food that you content. "
- Prophet Muhammad