Leviticus 25:2-4

²Speak unto the children of Israel, and say unto them: When ye come into the land which I give you, then shall the land keep a sabbath unto the LORD.

³Six years thou shalt sow thy field, and six years thou shalt prune thy vineyard, and gather in the produce thereof.

⁴But in the seventh year shall be a sabbath of solemn rest for the land, a sabbath unto the LORD; thou shalt neither sow thy field, nor prune thy vineyard.