Charles Spurgeon Commentary Leviticus 25:3-4

"Six years thou shalt sow thy field, and six years thou shalt prune thy vineyard, and gather in the fruits thereof; but in the seventh year shall be a sabbath of solemn rest for the land, a sabbath unto Jehovah: thou shalt neither sow thy field, nor prune thy vineyard." — Leviticus 25:3-4 (ASV)

Six years thou shalt sow thy field, and six years thou shalt prune thy vineyard, and gather in the fruit thereof; but in the seventh year shall be a sabbath of rest unto the land, a sabbath for the LORD:

Think of a Sabbath a year long, in which nothing was to be done but to worship God, and so to rest!