Leviticus 25:22
And ye shall sow the eighth year, and eat yet of old fruit until the ninth year; until her fruits come in ye shall eat of the old store. And ye shall sow the eighth year, and eat yet of old fruit until the ninth year; until her fruits come in ye shall eat of the old store.
Every seventh year cultivation was to stop and the land was to keep its yearly sabbath, lying in spontaneous growth. During that rest its spontaneous growth was left with free access for the benefit of the poor, with strangers and livestock, flocks and herds, alike permitted to share it. That rest was to invigorate worn-out productive soil. The arrangement taught that God is the Householder and owner of the land and the people are His tenants.
Under God's supervision and by special interposition the sixth-year crop was blessed to yield provision for three years, sustaining the people through the rest year and the waiting period when no harvest was gathered. They would sow in the eighth year after the sabbatical year yet keep eating from the old stored produce until the new harvest came in during the ninth year. The promise of provision across that interval depended on obeying God's instructions for the land. It was a constant lesson that God makes the land productive by His blessing when His people are obedient.
The same provision showed that He takes care of the poor and has made provision for them. His principle is liberality, to encourage generosity and to overcome stinginess and selfishness.