Leviticus 25:8-10

8‘You are also to count off seven sabbaths of years for yourself, seven times seven years, so that you have the time of the seven sabbaths of years, namely, forty-nine years.

9You shall then sound a ram’s horn abroad on 1the tenth day of the seventh month; on the day of atonement you shall sound a horn all through your land.

10You shall thus consecrate the fiftieth year and 2proclaim 3a release through the land to all its inhabitants. It shall be a jubilee for you, 4and 5each of you shall return to his own property, 6and each of you shall return to his family.