34 Absalom fled. Just then the sentry on duty looked up and saw a cloud of dust on the road from Horonaim alongside the mountain. He came and told the king, "I've just seen a bunch of men on the Horonaim road, coming around the mountain." 35 Then Jonadab exclaimed to the king, "See! It's the king's sons coming, just as I said!" 36 He had no sooner said the words than the king's sons burst in - loud laments and weeping! The king joined in, along with all the servants - loud weeping, many tears. 37 David mourned the death of his son a long time. 38 He 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.