Leviticus 25:53

"And as a yearly hired servant shall he be with him: and the other shall not rule with rigour over him in thy sight."

Cross References (ranked by relevance)

And ye shall take them as an inheritance for your children after you, to inherit them for a possession; they shall be your bondmen for ever: but over your brethren the children of Israel, ye shall not rule one over another with rigour.

Leviticus 25:43

Thou shalt not rule over him with rigour; but shalt fear thy God.