Why does the Torah repeat "vi'Yshavtem la'Vetach Aleha"?
Rashi: You will not worry about famine.
Ramban: It is an assurance that there will be enough to eat in Shemitah, and that they will not need to leave the land due to lack of food.
Seforno: It is an assurance that there will be plenty to eat in the land, and that they will not have to suffer the embarrassment of having to go and purchase food from other nations.
Having said "v'nasnah ha'Aretz Piryah", why does the Torah see fit to add "Va'achaltem Lachm'chem la'Sova'?
Rashi: To teach us that even in the stomach, the food will be blessed. 1
Seforno: It teaches us that the fruit was highly sustaining qualitatively, 2 in that the harvest of the sixth year will suffice for the seventh year as well.
Why did Rashi explain the end of the verse before the beginning?
Mizrachi: He did so to explain how this is unlike "vi'Yshavtem Al ha'Aretz la'Vetach" in the previous verse.