More literally: All the days of its desolation shall it rest that time which it rested not in your Sabbaths while ye dwelt upon it. That is, the periods of rest of which the land had been deprived would be made up to it. Compare 2 Chronicles 36:20-21.

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 they did not once or twice, but many times, while they were dwellers in the land; which seems to confirm pretty much the notion of their having omitted so many years, though that cannot be affirmed with certainty; see Jarchi on the place.

As long as it lieth desolate it shall rest; because it did not rest in your {r} sabbaths, when ye dwelt upon it.

(r) Which I commanded you to keep.

26:14-39 After God has set the blessing before them which would make them a happy people if they would be obedient, he here sets the curse before them, the evils which would make them miserable, if they were disobedient. Two things would bring ruin. 1. A contempt of God's commandments. They that reject the precept, will come at last to renounce the covenant. 2. A contempt of his corrections. If they will not learn obedience by the things they suffer, God himself would be against them; and this is the root and cause of all their misery. And also, The whole creation would be at war with them. All God's sore judgments would be sent against them. The threatenings here are very particular, they were prophecies, and He that foresaw all their rebellions, knew they would prove so. TEMPORAL judgments are threatened. Those who will not be parted from their sins by the commands of God, shall be parted from them by judgments. Those wedded to their lusts, will have enough of them. SPIRITUAL judgments are threatened, which should seize the mind. They should find no acceptance with God. A guilty conscience would be their continual terror. It is righteous with God to leave those to despair of pardon, who presume to sin; and it is owing to free grace, if we are not left to pine away in the iniquity we were born in, and have lived in.