Leviticus 25:2-4

2“Speak to the Israelites and say to them: ‘When you enter the land I am going to give you, the land itself must observe a sabbath to the LORD . 3For six years sow your fields, and for six years prune your vineyards and gather their crops. 4But in the seventh year the land is to have a year of sabbath rest, a sabbath to the LORD . Do not sow your fields or prune your vineyards.