Aliya Summary: This Aliya 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 — until the crop of the eighth year is ready to eat! The 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.”
Courtesy of this Aliya, if the Torah was man-made, it would take, at most, six years to disprove when the sixth year wouldn’t provide extra harvest. Luckily, it’s G-d-made, and we always get what we need.