Leviticus 25:3-5

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. 5Do not reap what grows of itself or harvest the grapes of your untended vines. The land is to have a year of rest.