34 Then Absalom fled. And the young man who was keeping watch lifted his eyes and looked, and there, many people were coming from the road on the hillside behind him. 35 And Jonadab said to the king, "Look, the king's sons are coming; as your servant said, so it is." 36 So it was, as soon as he had finished speaking, that the king's sons indeed came, and they lifted up their voice and wept. Also the king and all his servants wept very bitterly. 37 But Absalom fled and went to Talmai the son of Ammihud, king of Geshur. And David mourned for his son every day. 38 So Absalom fled and went to Geshur, and was there three years.
Matthew Henry's Commentary on 2 Samuel 13:34-38
Commentary on 2 Samuel 13:30-39
(Read 2 Samuel 13:30-39)
Jonadab was as guilty of Ammon's death, as of his sin; such false friends do they prove, who counsel us to do wickedly. Instead of loathing Absalom as a murderer, David, after a time, longed to go forth to him. This was David's infirmity: God saw something in his heart that made a difference, else we should have thought that he, as much as Eli, honoured his sons more than God.