Leviticus 23:3-6

³“‘Six days shall work be done, but on the seventh day is a Sabbath of solemn rest, a holy convocation; you shall do no kind of work. It is a Sabbath to Yahweh in all your dwellings.

⁴“‘These are the set feasts of Yahweh, even holy convocations, which you shall proclaim in their appointed season.

⁵In the first month, on the fourteenth day of the month in the evening, is Yahweh’s Passover.

⁶On the fifteenth day of the same month is the feast of unleavened bread to Yahweh. Seven days you shall eat unleavened bread.