Leviticus 23:6-8

6And on the fifteenth day of the same month is the Feast of Unleavened Bread to the Lord; for seven days you shall eat unleavened bread. 7 aOn the first day you shall have a holy convocation; you shall not do any ordinary work. 8But you shall present a food offering to the Lord for seven days. On the seventh day is a holy convocation; you shall not do any ordinary work.”

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