This is the first mention of the Sabbatical year; the law for it is given at length in Leviticus 25:2. Both the Sabbatical year and the weekly Sabbath are here spoken of exclusively in their relation to the poor, as bearing testimony to the equality of the people in their covenant with Yahweh. In the first of these institutions, the proprietor of the soil gave up his rights for the year to the whole community of living creatures, not excepting the beasts: in the latter, the master gave up his claim for the day to the services of his servants and cattle.
May be refreshed - Literally, “may take breath.”