Leviticus 16:31

16:31 It is to be a Sabbath of complete rest for you, and you must humble yourselves. It is a perpetual statute.

Leviticus 23:39

23:39 “‘On the fifteenth day of the seventh month, when you gather in the produce of the land, you must celebrate a pilgrim festival of the Lord for seven days. On the first day is a complete rest and on the eighth day is complete rest.