Leviticus 25:20-22

20If you say, ‘What will we eat in the seventh year if we do not sow and gather our produce?’

21I will command my blessing for you in the sixth year so that it may yield the produce for three years,

22and you may sow the eighth year and eat from that sixth year’s produce – old produce. Until you bring in the ninth year’s produce, you may eat old produce.