Leviticus 23:7

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 at even, 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 servile 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 servile work.

9 Yahweh spoke to Moses, saying,

10 Speak to the children of Israel, and tell them, When you are come into the land which I give to you, and shall reap the harvest of it, then you shall bring the sheaf of the first-fruits of your harvest to the priest: