Leviticus 23:4-9
4
"'These are the set feasts of Yahweh, even holy convocations, which you shall proclaim in their appointed season.
5
In the first month, on the fourteenth day of the month in the evening, is Yahweh's Passover.
6
On the fifteenth day of the same month is the feast of unleavened bread to Yahweh. Seven days you shall eat unleavened bread.
7
In the first day you shall have a holy convocation. You shall do no regular work.
8
But you shall offer an offering made by fire to Yahweh seven days. In the seventh day is a holy convocation: you shall do no regular work.'"