וַיִּגַּ֨שׁ אֵלִיָּ֜הוּ אֶל־כָּל־הָעָ֗ם וַיֹּ֙אמֶר֙ עַד־מָתַ֞י אַתֶּ֣ם פֹּסְחִים֮ עַל־שְׁתֵּ֣י הַסְּעִפִּים֒ אִם־יְהוָ֤ה הָֽאֱלֹהִים֙ לְכ֣וּ אַחֲרָ֔יו וְאִם־הַבַּ֖עַל לְכ֣וּ אַחֲרָ֑יו וְלֹֽא־עָנ֥וּ הָעָ֛ם אֹת֖וֹ דָּבָֽר׃
And Elijah came near unto all the people, and said: ‘How long halt ye between two opinions? if the LORD be God, follow Him; but if Baal, follow him.’ And the people answered him not a word.
Read halakhic rulings (Jewish law) on I Kings 18:21: and classical halakhic sources.