כִּ֤י אַתָּה֙ בָּ֣א אֶל־הָאָ֔רֶץ אֲשֶׁר־יְהוָ֥ה אֱלֹהֶ֖יךָ נֹתֵ֣ן לָ֑ךְ לֹֽא־תִלְמַ֣ד לַעֲשׂ֔וֹת כְּתוֹעֲבֹ֖ת הַגּוֹיִ֥ם הָהֵֽם׃
When thou art come into the land which the LORD thy God giveth thee, thou shalt not learn to do after the abominations of those nations.
Read halakhic rulings (Jewish law) on Deuteronomy 18:9: and classical halakhic sources.