Leviticus 23:2-4

2"Speak to the people of Israel and say to them, These are the appointed feasts of the Lord that you shall proclaim as holy convocations; they are my appointed 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 work. It is a Sabbath to the Lord in all your dwelling places.

4"These are the appointed feasts of the Lord, the holy convocations, which you shall proclaim at the time appointed for them.