What the Bible says about Elisha's Counsel
(From Forerunner Commentary)
The king of Syria wanted to do some dirty deeds against Israel, but God stirred up the spirit of His prophet Elisha so that he would understand what was happening in the secret councils of the king of Syria. Elisha would send a message to the king of Israel and say, "Don't go here or there, because, if you do, you will run into a huge, Syrian army, and it will attack you."
The king of Syria became totally frustrated because he could not spring any kind of surprise. Gathering his advisors together, he asked what was going on: "We've got a spy in the ranks. Who is it?" His advisors replied, "There are no spies here; nobody is being disloyal to you. It's just that the king of Israel has this prophet that keeps telling him what you're saying in your bedroom."
John W. Ritenbaugh
Satan (Part 3)