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 midrashic interpretation of II Chronicles 20:29: and classical rabbinic exegesis.