Isaiah 36:10 - Ellicott's Commentary On The Whole Bible

Am I now come up without the Lord... — The words may be simply an empty boast. Possibly, however, Isaiah’s teaching that it was Jehovah who brought the King of Assyria into Judah, and used him as an instrument (Isaiah 7:17-18), had become known, or Sennacherib may have dreamt, or have said that he had dreamt, that the God of Judah, irritated with the destruction of the high places, had given him this mission. He assumes the character of a defender of the faith. The inscriptions of Sennacherib are, it may be noted, conspicuous for like assertions. He delights, apparently, to claim a Divine sanction for the wars in which he is engaged (Records of the Past, i. 25, 9:23).