2 Chronicles 20:3 in the World English Bible
Jehoshaphat was alarmed, and set himself to seek the LORD. He proclaimed a fast throughout all Judah.
Context
2 Then there came some that told Jehoshaphat, saying, There cometh a great multitude against thee from beyond the sea on this side Syria; and, behold, they be in Hazazon-tamar, which is En-gedi.
3 And Jehoshaphat feared, and set himself to seek the LORD, and proclaimed a fast throughout all Judah.
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.