וַיְהִי֙ פַּ֣חַד אֱלֹהִ֔ים עַ֖ל כָּל־מַמְלְכ֣וֹת הָאֲרָצ֑וֹת בְּשָׁמְעָ֕ם כִּ֚י נִלְחַ֣ם יְהוָ֔ה עִ֖ם אוֹיְבֵ֥י יִשְׂרָאֵֽל׃
And a terror from God was on all the kingdoms of the countries, when they heard that the LORD fought against the enemies of Israel.
Read halakhic rulings (Jewish law) on II Chronicles 20:29: and classical halakhic sources.