Leviticus 25:20-23

20You may ask, “What will we eat in the seventh year if we do not plant or harvest our crops?” 21I will send you such a blessing in the sixth year that the land will yield enough for three years. 22While you plant during the eighth year, you will eat from the old crop and will continue to eat from it until the harvest of the ninth year comes in. 23“ ‘The land must not be sold permanently, because the land is mine and you reside in my land as foreigners and strangers.