Leviticus 25:20-22

And if you say, “What are we going to eat in the seventh year if we do not sow [seed] or gather in our crops?” then [this is My answer:] I will order My [special] blessing for you in the sixth year, so that it will produce [sufficient] crops for three years. When you are sowing the eighth year, you can still eat old things from the crops, eating the old until the ninth year when its crop comes in.