Leviticus 23:3-8

3“‘Six days work may be done, but on the seventh day there must be a Sabbath of complete rest, a holy assembly. You must not do any work; it is a Sabbath to the Lord in all the places where you live.

4“‘These are the Lord’s appointed times, holy assemblies, which you must proclaim at their appointed time.

5In the first month, on the fourteenth day of the month, at twilight, is a Passover offering to the Lord.

6Then on the fifteenth day of the same month will be the festival of unleavened bread to the Lord; seven days you must eat unleavened bread.

7On the first day there will be a holy assembly for you; you must not do any regular work.

8You must present a gift to the Lord for seven days, and the seventh day is a holy assembly; you must not do any regular work.’”