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5In the first month, on the fourteenth day of the month at even, is Jehovah`s passover. 6And on the fifteenth day of the same month is the feast of unleavened bread unto Jehovah: seven days ye shall eat unleavened bread. 7In the first day ye shall have a holy convocation: ye shall do no servile work. 8But ye shall offer an offering made by fire unto Jehovah seven days: in the seventh day is a holy convocation; ye shall do no servile work.
Leviticus 23:5-8 (ASV)