No weapon that is formed against thee shall prosper: and every tongue that shall rise against thee in judgment thou shalt condemn. This is the heritage of the servants of the Lord, and their righteousness is of me, saith the Lord.
Here God speaks of creating the smith who makes weapons of war and also the waster who uses such weapons; but He promises that in the restoration of Israel and Jerusalem under the Messiah no weapon formed to destroy them will prosper.
Not even a tongue speaking against them in judgment will prosper, but they shall condemn and subdue all their enemies [v 16-17].
– Dake A.R. Bible: page 781