And Jehoshaphat feared, and set himself to seek the LORD, and proclaimed a fast throughout all Judah.
2 Chronicles 20:3
Surrounding context
20:2 Then some came and told Jehoshaphat, saying, "A great multitude is coming against you from beyond the sea, from Syria; and they are in Hazazon Tamar" (which is En Gedi).
20:3 And Jehoshaphat feared, and set himself to seek the LORD, and proclaimed a fast throughout all Judah.
20:4 So Judah gathered together to ask help from the LORD; and from all the cities of Judah they came to seek the LORD.