וַיְהִ֣י אַֽחֲרֵיכֵ֡ן בָּ֣אוּ בְנֵי־מוֹאָב֩ וּבְנֵ֨י עַמּ֜וֹן וְעִמָּהֶ֧ם ׀ מֵֽהָעַמּוֹנִ֛ים עַל־יְהוֹשָׁפָ֖ט לַמִּלְחָמָֽה׃
And it came to pass after this, that the children of Moab, and the children of Ammon, and with them some of the Ammonites, came against Jehoshaphat to battle.
Read halakhic rulings (Jewish law) on II Chronicles 20:1: and classical halakhic sources.