Leviticus 25:8-10

The Year of Jubilee 8“ ‘Count off seven sabbath years—seven times seven years—so that the seven sabbath years amount to a period of forty-nine years. 9Then have the trumpet sounded everywhere on the tenth day of the seventh month; on the Day of Atonement sound the trumpet throughout your land. 10Consecrate the fiftieth year and proclaim liberty throughout the land to all its inhabitants. It shall be a jubilee for you; each of you is to return to your family property and to your own clan.