Bamidbar 15:23

את כל אשר צוה וגו׳ EVEN ALL THAT [THE LORD] HATH COMMANDED [YOU] etc. — This tells us that he who acknowledges the divinity of an idol is like one who denies the Torah in its entirety and all that the prophets prophesied, because it states, “[and if yo have erred and not done … all that the Lord hath commanded by Moses] from the day that the Lord commanded (Moses), and hence forth [throughout all your generations]” (cf. Sifrei Bamidbar 111:1).

אֵת֩ כׇּל־אֲשֶׁ֨ר צִוָּ֧ה יְהֹוָ֛ה אֲלֵיכֶ֖ם בְּיַד־מֹשֶׁ֑ה מִן־הַיּ֞וֹם אֲשֶׁ֨ר צִוָּ֧ה יְהֹוָ֛ה וָהָ֖לְאָה לְדֹרֹתֵיכֶֽם׃

all that the Lord has commanded you by the hand of Moshe, from the day that the Lord gave command, and henceforward throughout your generations;