2 Chronicles 20:1-5

Now it came about after this, that the sons of Moab and the sons of Ammon, together with some of the Meunites, came to make war against Jehoshaphat.

Then some came and reported to Jehoshaphat, saying, “A great multitude is coming against you from beyond the sea, from Aram; and behold, they are in Hazazon-tamar (that is Engedi).”

Jehoshaphat was afraid and turned his attention to seek the Lord; and he proclaimed a period of fasting throughout Judah.

So Judah gathered together to seek help from the Lord; they even came from all the cities of Judah to seek the Lord. Jehoshaphat’s Prayer

Then Jehoshaphat stood in the assembly of Judah and Jerusalem, in the house of the Lord in front of the new courtyard;