Deuteronomy 15:1, 12-15, 18

“At the end of every seven years you shall grant a remission of debts.

“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 not seem hard to you when you set him free, for he has given you six years with double the service of a hired man; so the LORD your God will bless you in whatever you do.