Leviticus 25:2-4

2“Speak to the Israelites and tell them: When you enter the land I am giving you, the land will observe a Sabbath to the Lord.

3You may sow your field for six years, and you may prune your vineyard and gather its produce for six years.

4But there will be a Sabbath of complete rest for the land in the seventh year, a Sabbath to the Lord: you are not to sow your field or prune your vineyard.