The Feast of Jubilee: Enactments Respecting: Release of Hebrew Servants
Source: TTT
Leviticus 25:40, 41, 54
Let him stay with you as a hired worker or temporary resident; he is to work for you until the Year of Jubilee. / Then he and his children are to be released, and he may return to his clan and to the property of his fathers. / Even if he is not redeemed in any of these ways, he and his children shall be released in the Year of Jubilee.