Leviticus 23:1-3

And the LORD spoke to Moses, saying, “Speak to the children of Israel, and say to them: ‘The feasts of the LORD, which you shall proclaim to be holy convocations, these are My feasts. ‘Six days shall work be done, but the seventh day is a Sabbath of solemn rest, a holy convocation. You shall do no work on it; it is the Sabbath of the LORD in all your dwellings.