Servants: Slaves or Bond: All Israelites Sold As, to be Free at the Jubilee
Source: TTT
Leviticus 25:10, 40, 41, 54
So you are to consecrate the fiftieth year and proclaim liberty in the land for all its inhabitants. It shall be your Jubilee, when each of you is to return to his property and to his clan. / 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.