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 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.