Deuteronomy 15:1, 12-15, 18

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

“If your brother, a Hebrew man, or a Hebrew woman, is sold to you and serves you six years, then in the seventh year you shall let him go free from you. And when you send him away free from you, you shall not let him go away empty-handed; you shall supply him liberally from your flock, from your threshing floor, and from your winepress. From what the LORD your God has blessed you with, you shall give to him. 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 thing today.

It shall not seem hard to you when you send him away free from you; for he has been worth a double hired servant in serving you six years. Then the LORD your God will bless you in all that you do.