22 but he didn't discipline Amnon. David doted on him because he was his firstborn. Absalom quit speaking to Amnon - not a word, whether good or bad - because he hated him for violating his sister Tamar.

Matthew Henry's Commentary on 2 Samuel 13:22

Commentary on 2 Samuel 13:21-29

(Read 2 Samuel 13:21-29)

Observe the aggravations of Absalom's sin: he would have Ammon slain, when least fit to go out of the world. He engaged his servants in the guilt. Those servants are ill-taught who obey wicked masters, against God's commands. Indulged children always prove crosses to godly parents, whose foolish love leads them to neglect their duty to God.