לֹֽא־יִהְיֶ֣ה בְ֭ךָ אֵ֣ל זָ֑ר וְלֹ֥א תִ֝שְׁתַּחֲוֶ֗ה לְאֵ֣ל נֵכָֽר׃
קײן אַנדער גאָט זאָל ניט זײַן בײַ דיר, און זאָלסט זיך ניט בוקן צו קײן פֿרעמדן גאָט.
Duties of the Heart
Among them, turning (excessively) to the physical pleasures. This is subtle association - that a man associates the service of his lusts with the service of the Creator. And the verse says: "There shall not be in you a strange god", to which our Rabbis expound: "what is the 'strange god' which is in the body of a man? - This is the evil inclination" (Talmud Shabbos 105b).