Here we have Elisha, with his spirit of prophecy, serving the king, as before helping the sons of the prophets; for that, as other gifts, is given to every man to profit withal; and, whatever abilities any man has of doing good, he is by them made a debtor both to the wise and unwise. Observe here,
I. How the king of Israel was informed by Elisha of all the designs and motions of his enemy, the king of Syria, more effectually than he could have been by the most vigilant and faithful spies. If the king of Syria, in a secret council of war, determined in which place to make an inroad upon the coasts of Israel, where he thought it would be the greatest surprise and they would be least able to make resistance, before his forces could receive his orders the king of Israel had notice of them from Elisha, and so had opportunity of preventing the mischief; and many a time, Kg2 6:8-10. See here, 1. That the enemies of God's Israel are politic in their devices, and restless in their attempts, against him. They shall not know, nor see, till we come in the midst among them, and slay them, Neh 4:11. 2. All those devices are known to God, even those that are deepest laid. He knows not only what men do, but what they design, and has many ways of countermining them. 3. It is a great advantage to us to be warned of our danger, that we may stand upon our guard against it. The work of God's prophets is to give us warning; if, being warned, we do not save ourselves, it is our own fault, and our blood will be upon our own head. The king of Israel would regard the warnings Elisha gave him of his danger by the Syrians, but not the warnings he gave him of his danger by his sins. Such warnings are little heeded by the most; they will save themselves from death, but not from hell.
II. How the king of Syria resented this. He suspected treachery among his senators, and that his counsels were betrayed, Kg2 6:11. But one of his servants, that had heard, by Naaman and others, of Elisha's wondrous works, concludes it must needs be he that gave this intelligence to the king of Israel, Kg2 6:12. What could not he discover who could tell Gehazi his thoughts? Here a confession of the boundless knowledge, as before of the boundless power, of Israel's God, is extorted from Syrians. Nothing done, said, thought, by any person, in any place, at any time, is out of the reach of God's cognizance.

The king of Syria warred against Israel - This was probably the same Ben-hadad who is mentioned Kg2 6:24. What was the real or pretended cause of this war we cannot tell; but we may say, in numberless war cases, as Calmet says in this: "An ambitious and restless prince always finds a sufficiency of reasons to color his enterprises."
In such and such a place - The Syrian king had observed, from the disposition of the Israelitish army, in what direction it was about to make its movements; and therefore laid ambuscades where he might surprise it to the greatest advantage.

And the man of God sent unto the king of Israel,.... That is, Elisha sent to him: saying:

beware that thou pass not such a place: not go to it, but avoid it, and pass another way:

for thither the Syrians are come down: are hidden, as the Targum; lie covered at the bottom of the hill, so as not to be seen.

DISCLOSES THE KING OF SYRIA'S COUNSEL. (Kg2 6:8-17)

the king of Syria warred against Israel--This seems to have been a sort of guerrilla warfare, carried on by predatory inroads on different parts of the country. Elisha apprised King Jehoram of the secret purpose of the enemy; so, by adopting precautionary measures, he was always enabled to anticipate and defeat their attacks. The frequency of his disappointments having led the Syrian king to suspect some of his servants of carrying on a treacherous correspondence with the enemy, he was informed about Elisha, whose apprehension he forthwith determined to effect. This resolution was, of course, grounded on the belief that however great the knowledge of Elisha might be, if seized and kept a prisoner, he could no longer give information to the king of Israel.