Hearken, ye that know righteousness Who not only understand, but love and practise it; whose persons are justified, whose nature is renewed, and whose lives are subject to my laws. These seem to be distinguished from those who are spoken of (Isa 51:1) as following after righteousness. These had attained what the others were only in pursuit of. The people in whose heart is my law Who are here opposed to the carnal Jews, that had the law written only on tables of stone. Compare 2 Corinthians 3:3; Hebrews 8:10. Fear ye not the reproach of men The censures of your carnal countrymen, who load their believing and godly brethren with a world of reproaches; but let not these things discourage you: for the moth shall eat them up, &c. Those that reproach you shall be easily and soon destroyed, and so God will avenge your cause upon them, and deliver you from their injurious treatment; and the worm shall eat them like wool Like a woollen garment, which is sooner corrupted by moths, or such creatures, than linen.
Related Commentaries of Isaiah 51:7
Isaiah 51:7-8
7 Hearken unto me, ye that know righteousness, the people in whose heart is my law; fear ye not the reproach of men, neither be ye afraid of their revilings.
8 For the moth shall eat them up like a garment, and the worm shall eat them like wool: but my righteousness shall be for ever, and my salvation from generation to generation.