Leviticus 25:16-17

¹⁶If there will be many years before the next Year of Celebration, the price will be higher; if there will be only a few years until the next Year of Celebration, the price will be lower. You could say that what he is really selling you is the number of crops which you can harvest before the next Year of Celebration.

¹⁷Do not cheat each other; instead, revere me. I, Yahweh your God, am the one who am commanding this.