Commentaries:
Jamieson, Fausset, and Brown
set it empty . . . that . . . brass . . . may burn, . . . that . . . scum . . . may be consumed—Even the consumption of the contents is not enough; the caldron itself which is infected by the poisonous scum must be destroyed, that is, the city itself must be destroyed, not merely the inhabitants, just as the very house infected with leprosy was to be destroyed (Leviticus 14:34-45).
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