Leviticus 25:14-16

14And if you make a sale to your neighbor or buy from your neighbor, you shall not wrong one another.

15You shall pay your neighbor according to the number of years after the jubilee, and he shall sell to you according to the number of years for crops.

16If the years are many, you shall increase the price, and if the years are few, you shall reduce the price, for it is the number of the crops that he is selling to you.