Leviticus 25:9-10

On the Day of Cleansing, you must blow the horn of a male sheep; this will be on the tenth day of the seventh month. You must blow the horn through the whole country. Make the fiftieth year a special year, and announce freedom for all the people living in your country. This time will be called Jubilee. You will each go back to your own property, each to your own family and family group.