Leviticus 25:15-17

¹⁵For the number of the years after the (last) jubilee thou shalt buy of thy neighbour; for the number of the years of the produce he shall sell to thee:

¹⁶According to the multitude of the years thou shalt increase the price, and according to the fewness of the years thou shalt diminish the price; for he selleth thee the amount of the fruits.

¹⁷And you shall not impose, a man upon his neighbour; but thou shalt fear thy God, for I am the Lord your God.