וַיִּקֹּ֧ד יְהוֹשָׁפָ֛ט אַפַּ֖יִם אָ֑רְצָה וְכָל־יְהוּדָ֞ה וְיֹשְׁבֵ֣י יְרוּשָׁלִַ֗ם נָֽפְלוּ֙ לִפְנֵ֣י יְהוָ֔ה לְהִֽשְׁתַּחֲוֺ֖ת לַיהוָֽה׃
And Jehoshaphat bowed his head with his face to the ground; and all Judah and the inhabitants of Jerusalem fell down before the LORD, worshipping the LORD.
Read halakhic rulings (Jewish law) on II Chronicles 20:18: and classical halakhic sources.