2 Samuel 15:12

And Absalom sent for Ahithophel, the Gilonite, David's counselor, from his city, even from Giloh, a city near Hebron, while he offered sacrifices, for he felt that the time for the open insurrection had now come. Ahithophel had probably joined Absalom's party some time before, turning traitor to David either from motives of ambition or on account of the affair with Bathsheba, who apparently was his relative. And the conspiracy was strong; for the people increased continually with Absalom. His venture seemed to be very successful. Absalom is a type of a rebel who disregards the Fourth Commandment. Such people are disobedient to their parents and oppose the lawfully constituted government. Their stock in trade consists of deceits and treason, and they end by being murderers.