25:4 seventh year. God’s command of a sabbatical year’s rest for the land was, no doubt, a test of faith, but modern agricultural science now recognizes it to be a valid principle for continued productivity. Just as God provided a double supply of bread on the sixth day for those who would keep His weekly Sabbath, so He also promised a threefold harvest in the sixth year (Leviticus 25:21) to feed His people through the seventh and eighth years (Leviticus 25:22). A sabbatical year for the land would also be a great means of controlling harmful insects.