Divrey Hayamim Bais 20:3

3 And Yehoshaphat feared, and set his face to inquire of Hashem, and proclaimed a tzom throughout all Yehudah.

Divrey Hayamim Bais 20:3 Meaning and Commentary

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 17:14-19 ) , 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.

Divrey Hayamim Bais 20:3 In-Context

1 0 It came to pass after this also, that the Bnei Moav, and the Bnei Ammon, and with them some Ammonim, came against Yehoshaphat to make milchamah.

2 Then there came some that told Yehoshaphat, saying, There cometh a great multitude against thee from beyond the Yam (Dead Sea), from Aram; and, hinei, they are in Chatzatzon-Tamar, which is Ein-Gedi.

3 And Yehoshaphat feared, and set his face to inquire of Hashem, and proclaimed a tzom throughout all Yehudah.

4 And Yehudah gathered themselves together, to ask help of Hashem, even from all the towns of Yehudah they came to seek help of Hashem.

5 And Yehoshaphat stood in the Kehal Yehudah and Yerushalayim, in the Beis Hashem, before the khatzer hachadashah,