2 Samuel 16:21

And Ahithophel said. — The counsel of Ahithophel was in effect that Absalom should make the breach between him and his father absolute and irreconcilable. His followers would thus be assured of the impossibility of his securing a pardon for himself while they were left to their fate. After adopting this course, he must necessarily persist to the end. The taking of the harem of his predecessor by the incoming monarch was an Oriental custom, to the enormity of which the mind was blunted by the practice of polygamy.