Leviticus 25:8-10

8“Count seven of these years seven times for a total of 49 years.

9On the tenth day of the seventh month, the special day for the payment for sin, sound rams’ horns throughout the country.

10Set apart the fiftieth year as holy, and proclaim liberty to everyone living in the land. This is your jubilee year. Every slave will be freed in order to return to his property and to his family.