Leviticus 25:2-4

2"Speak to the people of Israel and say to them, When you come into the land that I give you, the land shall keep a Sabbath to the Lord.

3For six years you shall sow your field, and for six years you shall prune your vineyard and gather in its fruits,

4but in the seventh year there shall be a Sabbath of solemn rest for the land, a Sabbath to the Lord. You shall not sow your field or prune your vineyard.