Leviticus 25:14 TLB

[14] Because of this, if the land is sold or bought during the preceding forty-nine years, a fair price shall be arrived at by counting the number of years until the Jubilee. If the Jubilee is many years away, the price will be high; if few years, the price will be low; for what you are really doing is selling the number of crops the new owner will get from the land before it is returned to you.