'Sabbath rest' in the Bible

"On the fifteenth day of the seventh month, when you've harvested the produce of the land, you are to observe the festival of the LORD for seven days. The first day is to be a Sabbath rest, and the eighth day also is to be a Sabbath rest.

but during the seventh year the land shall have a sabbath rest, a sabbath to the Lord; you shall not sow your field nor prune your vineyard.

And all of you shall have for food whatever the [untilled] land produces during its Sabbath year; yourself, and your male and female slaves, your hired servant, and the foreigners who reside among you,