John Trapp on Isaiah 54:17

Ver. 17. No weapon that is formed againſt thee ſhall proſper] But ſhall be as the Poets fain of Aiax his ſword, which ſo long as he uſed againſt men, his enemies, ſerved for help and defence: but after he began to abuſe it to the hurt of hurtleſs beaſts, it turned into his own bowels.

And every tongue—thou ſhalt condemn] As the eclipſed Moon by keeping her motion, wades out of the ſhadow, and recovers her ſplendour, ſo ſhalt thou when ſlandered. See Pſal. 37.6. with the Note.

This is the heritage] Given them freely, and for perpetuity.

And their righteouſneſſe] The clearing up of their wronged innocency.