Leviticus 25:14-16

14If you make a sale to your fellow citizen or buy from your fellow citizen, no one is to wrong his brother.

15You may buy it from your fellow citizen according to the number of years since the last jubilee; he may sell it to you according to the years of produce that are left.

16The more years there are, the more you may make its purchase price, and the fewer years there are, the less you must make its purchase price, because he is only selling to you a number of years of produce.