Isaiah 51:8

“For the moth shall eat them up like a garment, &c.] Either these reproaches, or the persons that reproach; as a garment is eaten by the moth, secretly, slowly, surely, and at last completely, so that it becomes utterly good for nothing; so secret, gradual, sure and certain, complete and perfect, will be the ruin and destruction of the enemies of Christ and his people: and the worm shall eat them like wool; or as a woollen garment, which is most liable to be motheaten; for the moth and worm are much the same, as Kimchi and Ben Melech observe; who say, that in the Arabic tongue the moth is called by a name much of the same sound with this word in the text; and the sense is, that as a woollen…”

“(See on Isa 50:9; Job 4:18-20). Not that the moth eats men up, but they shall be destroyed by as insignificant instrumentality as the moth that eats a garment.”

“For the moth - (see Isaiah 50:9). The idea is, that they shall be consumed as the moth eats up a garment; or rather, that the moth itself shall consume them as it does a garment: that is, that they were so weak when compared with Yahweh that even the moth, one of the smallest, and most contemptible of insects, would consume them. An expression remarkably similar to this occurs in Job 4:18-20 : Behold in his servants he putteth no confidence, And his angels he chargeth with frailty; How much more true is this of those who dwell in houses of clay, Whose foundation is in the dust! They are crashed before the moth-worm! Between morning and evening they are destroyed; Without anyone regarding it,…”

“Like wool - Like a woollen garment, which is sooner corrupted by moths or such creatures, than linen. Isaiah 51:9”

“the moth: Isa 50:9, Isa 66:24; Job 4:19, Job 13:28; Hos 5:12 my righteousness: Isa 51:6, Isa 45:17, Isa 46:13; Luk 1:50 Isaiah 51:9”