Charles Ellicott Commentary Isaiah 42:13

"Jehovah will go forth as a mighty man; he will stir up [his] zeal like a man of war: he will cry, yea, he will shout aloud; he will do mightily against his enemies." — Isaiah 42:13 (ASV)

The Lord shall go forth ... —The boldly anthropomorphic image prepares the way for the even more dreadful picture of Isaiah 63:1, which is outwardly set in the same region. As if roused from slumber, Jehovah stirs up His jealous indignation against the idols, which had seemed to sleep, and rushes to the battle as with the war-cry of a mighty one.