Then the land shall enjoy its Sabbaths all the days it lies desolate, while you are in the land of your enemies. At that time the land will rest and enjoy its Sabbaths.
34. Then shall the land enjoy her Sabbaths. In order that the observance of the Sabbath should be the more honored, God in a manner associated the land in it together with man; for whereas the land had rest every seventh year from sowing, and harvest, and all cultivation, He thus desired to stir up men more effectually to a greater reverence for the Sabbath.
After God had set the blessing before them (the life and good which would make them a happy people if they would be obedient), he here sets the curse before them, the death and evil which would make them as miserable if they were disobedient.
Commenting on Leviticus 26:14-39
As long as it lieth desolate it shall rest,.... From tillage, neither man nor beast working upon it; for which reason such a space of time was called a sabbath: because it did not rest in your sabbaths, when you dwelt upon it; they manured and tilled it on the seventh years, as on others, neglecting the command which God had given them; and this...