Leviticus 25:14-16

14And if thou shalt sell any to thy neighbour, or buy any thing from thy neighbour’s hand, ye shall not oppress one another: 15According to the number of years after the jubilee thou shalt buy of thy neighbour, and according to the number of years of the fruits he shall sell to thee: 16According to the multitude of years thou shalt increase the price of it, and according to the fewness of years thou shalt diminish the price of it: for according to the number of the years of the fruits doth he sell to thee.