2 Samuel 15:10-13

10And Absalom sent emissaries into all the tribes of Israel, saying, When ye hear the sound of the trumpet, ye shall say, Absalom reigns in Hebron.

11And with Absalom went two hundred men out of Jerusalem, that were invited; and they went in their simplicity, and they knew nothing.

12And Absalom sent for Ahithophel the Gilonite, David's counsellor, from his city, from Giloh, while he offered the sacrifices. And the conspiracy gathered strength; and the people increased continually with Absalom.

13And there came one to David who reported saying, The hearts of the men of Israel are after Absalom.