Leviticus 23:6

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.