Deuteronomy 15:12-17

“If your kinsman, a Hebrew man or woman, is sold to you, then he shall serve you six years, but in the seventh year you shall set him free. When you set him free, you shall not send him away empty-handed. You shall furnish him liberally from your flock and from your threshing floor and from your wine vat; you shall give to him as the LORD your God has blessed you. You shall remember that you were a slave in the land of Egypt, and the LORD your God redeemed you; therefore I command you this today. It shall come about if he says to you, ‘I will not go out from you,’ because he loves you and your household, since he fares well with you; then you shall take an awl and pierce it through his ear into the door, and he shall be your servant forever. Also you shall do likewise to your maidservant.