Leviticus 23:1-3

The LORD spoke again to Moses, saying, “Speak to the sons of Israel and say to them, ‘The LORD’S appointed times which you shall proclaim as holy convocations—My appointed times are these: ‘For six days work may be done, but on the seventh day there is a sabbath of complete rest, a holy convocation. You shall not do any work; it is a sabbath to the LORD in all your dwellings.