Parashas Eikev · Passuk 9:21
As for that sinful thing you had made, the calf, I took it and put it to the fire; I broke it to bits and ground it thoroughly until it was fine as dust, and I threw its dust into the brook that comes down from the mountain.
Torah Temimah points to Avodah Zarah 54a.
TT lemma: ואכת אתו (unit 2 of 2).
English: “And I crushed it” — this teaches that the destruction of an idol is by grinding and scattering it to the wind, or casting it into the sea.
Custom (how to destroy an idol)
Proper biur of avodah zarah is pulverizing and dispersing; the method depends on whether recovery is plausible.