Leviticus 25:8-10

8And thou shalt count seven sabbaths of years, seven times seven years; so that the days of the seven sabbaths of years be unto thee forty-nine years.

9Then shalt thou cause the loud sound of the trumpet to go forth in the seventh month, on the tenth of the month; on the day of atonement shall ye cause the trumpet to go forth throughout your land.

10And ye shall hallow the year of the fiftieth year, and proclaim liberty in the land unto all the inhabitants thereof; a [year of] jubilee shall it be unto you, and ye shall return every man unto his possession, and ye shall return every man unto his family;