Leviticus 27:17-19

17-19. From the year of jubilee If the vow covered the entire ante-jubilee period, the whole fifty shekels must be paid either in one payment or in annual instalments. But if a portion of the ante-jubilee period has elapsed before the vow is made, the priest shall deduct the years already past and base his estimate on the years that remain. The aggregate sum varies, but the annual redemption premium is invariable for any given quantity of land. This estimate presupposes that the land was inalienable, and that only the usufruct for a limited time could be vowed, since the land reverted to its original owner or his heirs, without compensation, when the trumpet of jubilee sounded. To this general law there are two exceptions, as stated in Leviticus 27:20.

Assured to him Or, as we would say, deeded back to him.