Joel 1:14

Consecrate a fast,
Proclaim a solemn assembly;
Gather the elders
And all the inhabitants of the land
To the house of the Lord your God,
And cry out to the Lord.

Joel 2:15-16

Blow a trumpet in Zion,
Consecrate a fast, proclaim a solemn assembly,

Jonah 3:8

But both man and beast must be covered with sackcloth; and let men call on God earnestly that each may turn from his wicked way and from the violence which is in his hands.

Leviticus 23:36

For seven days you shall present an offering by fire to the Lord. On the eighth day you shall have a holy convocation and present an offering by fire to the Lord; it is an assembly. You shall do no laborious work.

Deuteronomy 29:10-11

“You stand today, all of you, before the Lord your God: your chiefs, your tribes, your elders and your officers, even all the men of Israel,

2 Chronicles 20:3-4

Jehoshaphat was afraid and turned his attention to seek the Lord, and proclaimed a fast throughout all Judah.

2 Chronicles 20:13

All Judah was standing before the Lord, with their infants, their wives and their children.

Nehemiah 8:18

He read from the book of the law of God daily, from the first day to the last day. And they celebrated the feast seven days, and on the eighth day there was a solemn assembly according to the ordinance.

Nehemiah 9:2-3

The descendants of Israel separated themselves from all foreigners, and stood and confessed their sins and the iniquities of their fathers.

Treasury of Scripture Knowledge

Summary

Sanctify ye a fast, call a solemn assembly, gather the elders and all the inhabitants of the land into the house of the LORD your God, and cry unto the LORD,

Cry

Bible References

Sanctify

Joel 2:15
Blow a trumpet in Zion,
Consecrate a fast, proclaim a solemn assembly,
2 Chronicles 20:3
Jehoshaphat was afraid and turned his attention to seek the Lord, and proclaimed a fast throughout all Judah.

The elders

Deuteronomy 29:10
“You stand today, all of you, before the Lord your God: your chiefs, your tribes, your elders and your officers, even all the men of Israel,
2 Chronicles 20:13
All Judah was standing before the Lord, with their infants, their wives and their children.
Nehemiah 9:2
The descendants of Israel separated themselves from all foreigners, and stood and confessed their sins and the iniquities of their fathers.

Cry

Jonah 3:8
But both man and beast must be covered with sackcloth; and let men call on God earnestly that each may turn from his wicked way and from the violence which is in his hands.