2 Chronicles 20:3

And Jehoshaphat feared,.... Exceedingly, as the Targum adds, not merely because of the number of his enemies, for he had forces enough to go forth against them, see 2 Chronicles 17:14, but chiefly because the Lord had told him that wrath was upon him from him, 2 Chronicles 19:2 and he might fear that this was the time for the execution of it:

and set himself to seek the Lord; by prayer and supplication, with all seriousness, fervour, and constancy:

and proclaimed a fast throughout all Judah; a day of humiliation and mourning for sin before the Lord; when they were ordered to abstain from bodily food and labour, that they might be fit and more at leisure for spiritual exercises.