10 Then Absalom sent spies throughout all the tribes of Israel, saying, "As soon as you hear the sound of the trumpet, then you shall say, 'Absalom reigns in Hebron!' " 11 And with Absalom went two hundred men invited from Jerusalem, and they went along innocently and did not know anything. 12 Then Absalom sent for Ahithophel the Gilonite, David's counselor, from his city--from Giloh--while he offered sacrifices. And the conspiracy grew strong, for the people with Absalom continually increased in number.
Matthew Henry's Commentary on 2 Samuel 15:10-12
Commentary on 2 Samuel 15:7-12
(Read 2 Samuel 15:7-12)
See how willing tender parents are to believe the best concerning their children. But how easy and how wicked is it, for children to take advantage of good parents, and to deceive them with the show of religion! The principal men of Jerusalem joined Absalom's feast upon his sacrifice. Pious persons are glad to see others appear religious, and this gives occasion for deceptions. The policy of wicked men, and the subtlety of Satan, are exerted to draw good persons to countenance base designs.