Leviticus 25:10

And ye shall hallow the fiftieth year, and proclaim liberty throughout all the land unto all the inhabitants thereof. This proclamation of freedom from the toil and drudgery which came into the world as a consequence of sin was most fitting just after the great reconciliation of the people with the covenant God had been completed. Twice in every century two fallow years followed upon each other, and the land had an opportunity to recover its strength. It shall be a jubilee unto you; and ye shall return every man unto his possession, and ye shall return every man unto his family, as the further ordinances prescribed.