Leviticus 25:41-43

Then shall he depart Thou shalt not suffer him or his to abide longer in thy service, as thou mightest do in the year of release, Exodus 21:2; Exodus 21:6. They are my servants They, no less than you, are members of my church and people; such as I have chosen out of all the world to serve me here, and to enjoy me hereafter, and therefore are not to be oppressed, neither are you absolute lords over them to deal with them as you please. Fear thy God Though thou dost not fear them who are in thy power, and unable to right themselves, yet fear that God who hath commanded thee to use them kindly, and who can and will avenge their cause, if thou oppress them.