NET
2 ‘I will go before you and level mountains. Bronze doors I will shatter and iron bars I will hack through.
Darby
2 I will go before thee, and make the elevated places plain; I will break in pieces the brazen doors, and cut asunder the bars of iron;
KJV
2 I will go before thee, and make the crooked places straight: I will break in pieces the gates of brass, and cut in sunder the bars of iron: