New Defender's Study Bible Notes
13:21 was very wroth. David was angry at Amnon, but did nothing about it. Amnon was his firstborn son (II Samuel 3:2), yet his crime, according to the law, was a capital crime. Even if David could not prescribe such a penalty for his son, he should have done something. After waiting for two years (II Samuel 13:23), Absalom decided to act on his own.