Leviticus 25:43 in the King James Version
Thou shalt not rule over him with rigour; but shalt fear thy God.
Context
42 For they are my servants, whom I brought out of the land of Egypt. They shall not be sold as slaves.
43 You shall not rule over him with harshness, but shall fear your God.
44 “‘As for your male and your female slaves, whom you may have from the nations that are around you, from them you may buy male and female slaves.