Leviticus 23:6-8

6 On the fifteenth day of the same month is the festival of matzah; for seven days you are to eat matzah.
7 On the first day you are to have a holy convocation; don't do any kind of ordinary work.
8 Bring an offering made by fire to ADONAI for seven days. On the seventh day is a holy convocation; do not do any kind of ordinary work.'"
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