Isaiah 36:14

Thus saith the king
The king of Assyria, whom he personated, whose general and ambassador he was; so he spake to command the greater awe of the people, and the more to terrify them: let not Hezekiah deceive you;
with fair words, promising protection and safety, making preparations for the defence of the city, and to oblige the besiegers to break up the siege of it: for he shall not be able to deliver you;
but if he was not, his God, whom he served, and in whom he trusted, was able to deliver them, and did deliver them; though he endeavoured to dissuade them from trusting in him, or hearkening to Hezekiah's persuasions thereunto, as in the following verse.