2 Chronicles 20:4
And Judah gathered themselves together, to ask help of the Lord: even out of all the cities of Judah they came to seek the Lord.
Cross-reference
2 Chronicles 6:34
Historical context
2 Chronicles 6:34 records Solomon's prayer about people praying when going to war—this gathering enacts that very scenario.
Psalm 50:15
Parallel
Psalm 50:15 commands calling on God in trouble with a rescue promise — mirroring Judah's action of gathering to seek the Lord.
Psalm 60:10–12
Parallel
Psalm 60:10-12 prays for God's help against enemies, deeming human help worthless — the very situation Judah faces as they seek the Lord.
Joel 1:14
Parallel
Joel 1:14 calls for a solemn assembly and crying to the Lord in crisis—identical to this gathering to seek God's help.