Or HaChaim on Leviticus 19:4/אור החיים על ויקרא י״ט:ד׳

1 אל חפנו אל האלילם "Do not turn to the idols, etc. This verse prohibits idolatrous thoughts. One should not turn one's thoughts in that direction. In order to understand this better remember that when a Jew thinks of idolatry it is as if he regresses, i.e. read אחורים, "backwards," instead of אחרים, "others." On the other hand, when a Jew dwells on the subject of the true G'd, it is as if G'd turns His face towards him.

2האלילם, the idols. The reason the Torah uses the plural form when speaking of even a single idol is that idolatry represents a belief in a multiplicity of domains in this world, separation of powers. Judaism, however, represents the belief in a single Creator, in a single Supreme Power in this universe. When idols are described as deities, אלוהים, they are automatically described as אלוהים אחרים, other deities, i.e. in the plural.

3ואלהי מסכה לא תעשו לכם, "neither construct for yourselves molten gods;" seeing that the Torah has already prohibited all kinds of idols why did it single out the molten gods as something we must not construct? Besides, why did the Torah have to stress the word לכם, "for yourselves?" Perhaps we can understand this in connection with chapter 18 in Tikkuney Ha-Zohar where we read that if someone performs a good deed G'd's presence will dwell upon him; if, however, he transgresses one of G'd's commandments the שכינה will depart from the respective organ that should have performed a commandment and that organ will become the home of a spirit of defilement, of טומאה. This spirit of טומאה is the "iron curtain" which is a barrier between such a person and his G'd. Isaiah 59,2 spelled it out when he said: "your iniquities have created a barrier between yourselves and your G'd." When the Torah writes ואלהי מסכה, this means "and a god which forms an iron curtain (from the word מסך, curtain) you must not construct for yourselves." If you do, you would separate yourselves from your source of life. G'd adds the words: "I am the Lord your G'd," to remind you Who it is that you sever your connections with if you violate this commandment.

4The words: "I am the Lord your G'd" may also mean that if we refrain from violating this commandment we qualify for the promise that the Lord is indeed our G'd. Our sages in Chulin 5 phrased this as follows: "Anyone who denies the validity of idolatry is considered as if he had expressed his belief in everything written in the Torah."

5A moral-ethical dimension of this verse may teach us the lesson spelled out in Megillah 28 in connection with Kings II 3,14 לולי פני יהושפט אני נשא אם אביט עליך, "if I did not (at the same time) behold the face of Jehoshaphat king of Yehudah I would not even look at your face." Elisha explained to Achav that it is forbidden to even look at a confirmed sinner such as he. G'd warns that we must not make ourselves into a molten image so that it will be prohibited to even look at ourselves.