Rashi on Leviticus 19:4/רש"י על ויקרא י״ט:ד׳

1אל תפנו אל האלילים TURN YE NOT UNTO THE IDOLS — to worship them (Sifra, Kedoshim, Section 1 10). The word אלילים, idols, is connected with “not“ (אל) — it is regarded of “none" import.

2ואלהי מסכה [NOR MAKE TO YOURSELVES] MOLTEN GODS - In the beginning they may appear as “nought" (אלילים) but if you turn unto them you will in the end make them gods (Sifra, Kedoshim, Section 1 11). The translation therefore is: do not turn unto these “non-entities", so that you may not in the end make them into molten gods for yourselves.

3לא תעשו לכם implies: do not you make molten gods for others nor let others make such for you. Should you, however, say that לא תעשו לכם implies only “you shall not make them for yourselves" but others may make them for you, then I reply: But Scripture has already stated (Exodus 20:3) “Thou shalt have [no other gods]” — neither your own idol nor one which is the idol of (made by) others (Sifra, Kedoshim, Section 1 12).