וַיָּרִ֖יעוּ אִ֣ישׁ יְהוּדָ֑ה וַיְהִ֗י בְּהָרִ֙יעַ֙ אִ֣ישׁ יְהוּדָ֔ה וְהָאֱלֹהִ֗ים נָגַ֤ף אֶת־יָֽרָבְעָם֙ וְכָל־יִשְׂרָאֵ֔ל לִפְנֵ֥י אֲבִיָּ֖ה וִיהוּדָֽה׃
Then the men of Judah gave a shout; and as the men of Judah shouted, it came to pass, that God smote Jeroboam and all Israel before Abijah and Judah.
Read halakhic rulings (Jewish law) on II Chronicles 13:15: and classical halakhic sources.