2 Chronicles 20:3 - Clarke's commentary and critical notes on the Bible

And Jehoshaphat feared, and set himself to seek the LORD, and proclaimed a fast throughout all Judah. Jehoshaphat feared - He found that he could not possibly stand against such a numerous army, and therefore could not expect to be delivered except by the strong arm of God. To get this assistance, it was necessary to seek it; and to get such extraordinary help, they should seek it in an extraordinary way; hence he proclaimed a universal fast, and all the people came up to Jerusalem to seek the Lord.