Leviticus 23:6 WEB

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.''