Divrey Hayamim Bais 20:2-4

Orthodox Jewish Bible

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.