Leviticus 23:36

23:36 For seven days you must present a gift to the Lord. On the eighth day there is to be a holy assembly for you, and you must present a gift to the Lord. It is a solemn assembly day; you must not do any regular work.

Deuteronomy 16:8

16:8 You must eat bread made without yeast for six days. The seventh day you are to hold an assembly for the Lord your God; you must not do any work on that day.

Nehemiah 8:18

8:18 Ezra read in the book of the law of God day by day, from the first day to the last. They observed the festival for seven days, and on the eighth day they held an assembly as was required.

Joel 1:14

1:14 Announce a holy fast;

proclaim a sacred assembly.

Gather the elders and all the inhabitants of the land

to the temple of the Lord your God,

and cry out to the Lord.