Leviticus 25:47-55

Redemption of Hebrews from Aliens. The right of redemption is to hold in the case of a Hebrew who has sold himself to a resident alien. His services are regarded as leased till the fiftieth year, and the price to be paid for his freedom by a relative will vary with the number of years to run. He is to be treated like a wage earner. Just as Yahweh alone is the owner of the land, so Israelites can be slaves of Him alone.