Leviticus 23:4-8

4“ ‘These are the Lord’s appointed festivals, the sacred assemblies you are to proclaim at their appointed times:

5The Lord’s Passover begins at twilight on the fourteenth day of the first month.

6On the fifteenth day of that month the Lord’s Festival of Unleavened Bread begins; for seven days you must eat bread made without yeast.

7On the first day hold a sacred assembly and do no regular work.

8For seven days present a food offering to the Lord. And on the seventh day hold a sacred assembly and do no regular work.’ ”