Deuteronomy 15:12-18

12“If your fellow Israelite, a Hebrew man or woman, is sold to you, and serves you for six years, then in the seventh year you shall set him free [from your service].

13When you set him free, you shall not let him go away empty-handed.

14You shall give him generous provisions from your flock, from your threshing floor and from your wine press; you shall give to him as the Lord your God has blessed you.

15And you shall remember and thoughtfully consider that you were [once] a slave in the land of Egypt, and the Lord your God redeemed you; therefore, I am commanding you these things today.

16Now if the servant says to you, ‘I will not leave you,’ because he loves you and your household, since he is doing well with you;

17then take an awl and pierce it through his ear into the door, and he shall [willingly] be your servant always. Also you shall do the same for your maidservant.

18“It shall not seem hard to you when you set him free, for he has served you six years with double the service of a hired man; so the Lord your God will bless you in everything you do.