Deuteronomy 15:12-18

12If your fellow Hebrew – whether male or female – is sold to you and serves you for six years, then in the seventh year you must let that servant go free.

13If you set them free, you must not send them away empty-handed.

14You must supply them generously from your flock, your threshing floor, and your winepress – as the Lord your God has blessed you, you must give to them.

15Remember that you were a slave in the land of Egypt and the Lord your God redeemed you; therefore, I am commanding you to do this thing today.

16However, if the servant says to you, “I do not want to leave you,” because he loves you and your household, since he is well off with you,

17you shall take an awl and pierce a hole through his ear to the door. Then he will become your servant permanently (this applies to your female servant as well).

18You should not consider it difficult to let him go free, for he will have served you for six years, twice the time of a hired worker; the Lord your God will bless you in everything you do.