This section addresses an obvious concern: "What will we eat in the seventh year if we do not sow our gather our grain?!" G‑d reassures us that He will bless the sixth year's harvest, and it will produce enough to provide for three years! The Torah then gives the rationale for the prohibition against selling land for perpetuity (instead, land can only be "leased" until the Jubilee year) — "Because the Land belongs to Me; you are strangers and residents with Me." The seller of land, or his relative on his behalf, has the option of "redeeming" the land from the purchaser — provided that two years have passed from the date of purchase.