Leviticus 23:2-4

2“Speak to the children of Israel and say to them, ‘The appointed times (established feasts) of the Lord which you shall proclaim as holy convocations—My appointed times are these:

3‘For six days work may be done, but the seventh day is the Sabbath of complete rest, a holy convocation (calling together). You shall not do any work [on that day]; it is the Sabbath of the Lord wherever you may be.

4‘These are the appointed times of the Lord, holy convocations which you shall proclaim at their appointed times: