Leviticus 23:2-7

2“Speak to the Israelites and say to them: ‘These are my appointed festivals, the appointed festivals of the LORD, which you are to proclaim as sacred assemblies.

The Sabbath 3“ ‘There are six days when you may work, but the seventh day is a day of sabbath rest, a day of sacred assembly. You are not to do any work; wherever you live, it is a sabbath to the LORD .

The Passover and the Festival of Unleavened Bread 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.