Leviticus 23:6

3 Six days shall work be done: but the seventh day is the sabbath of rest, an holy convocation; ye shall do no work therein: it is the sabbath of the LORD in all your dwellings.

4 These are the feasts of the LORD, even holy convocations, which ye shall proclaim in their seasons.

5 In the fourteenth day of the first month at even is the LORD'S passover.

6 And on the fifteenth day of the same month is the feast of unleavened bread unto the LORD: seven days ye must eat unleavened bread.

7 In the first day ye shall have an holy convocation: ye shall do no servile work therein.

8 But ye shall offer an offering made by fire unto the LORD seven days: in the seventh day is an holy convocation: ye shall do no servile work therein.

9 And the LORD spake unto Moses, saying,