C. F. Keil and Franz Delitzsch on 2 Kings 19:10-11

2Ki 19:10-11 ישּׁיאך אל: “let not thy God deceive thee,” i.e., do not allow yourself to be deceived by your confidence in your God. לאמר, to say, i.e., to think or believe, that Jerusalem will not be given, etc. To shatter this confidence, Sennacherib reminds him of the deeds of the Assyrian kings. להחרימם, to ban them, i.e., by smiting them with the ban. The verb החרים is chosen with emphasis, to express the unsparing destruction. הנּצל ואתּה: and thou shouldst be saved? - a question implying a strong negative.