Leviticus 23:1

1The LORD spoke to Moses, saying,

2“Speak to the children of Israel, and tell them, ‘The set feasts of the LORD, which you shall proclaim to be holy convocations, even these are my set feasts.

3“‘Six days shall work be done, but on the seventh day is a Sabbath of solemn rest, a holy convocation; you shall do no kind of work. It is a Sabbath to the LORD in all your dwellings.