Charles Ellicott Commentary 2 Kings 19:10

"Thus shall ye speak to Hezekiah king of Judah, saying, Let not thy God in whom thou trustest deceive thee, saying, Jerusalem shall not be given into the hand of the king of Assyria." — 2 Kings 19:10 (ASV)

Let not your God ... deceive you. —Through prophets, or dreams, or any other recognized medium of communication.