2 Samuel 15:10-13

10But Absalom sent spies to all the tribes of Israel to say, “As soon as you hear the sound of the shofar, then you are to say, ‘Absalom has become king in Hebron!’”

11Now 200 men from Jerusalem went with Absalom, who were invited and were going innocently, knowing nothing of the situation.

12Also Absalom sent for Ahithophel the Gilonite, David’s counselor from his town Giloh, while he was offering the sacrifices. So the conspiracy gained momentum for the people following Absalom continued to increase.

13Then a messenger came to David saying, “The hearts of the men of Israel are following Absalom.”