Albert Barnes Commentary Isaiah 36:14

"Thus saith the king, Let not Hezekiah deceive you; for he will not be able to deliver you:" — Isaiah 36:14 (ASV)

Let not Hezekiah deceive you - By inducing you to put your trust in Yahweh or in himself; or with promises that you will be delivered.

Not be able to deliver you - In 2 Kings 18:29, it is added, out of his hand; but the sense is substantially the same.