Leviticus 25:8-10

“You shall count seven weeks of years, seven times seven years, so that the time of the seven weeks of years shall give you forty-nine years. Then you shall sound the loud trumpet on the tenth day of the seventh month. On the Day of Atonement you shall sound the trumpet throughout all your land. And you shall consecrate the fiftieth year, and proclaim liberty throughout the land to all its inhabitants. It shall be a jubilee for you, when each of you shall return to his property and each of you shall return to his clan.