10 when someone told me, saying, 'Look, Saul is dead,' thinking to have brought good news, I arrested him and had him executed in Ziklag--the one who thought I would give him a reward for his news. 11 How much more, when wicked men have killed a righteous person in his own house on his bed? Therefore, shall I not now require his blood at your hand and remove you from the earth?" 12 So David commanded his young men, and they executed them, cut off their hands and feet, and hanged them by the pool in Hebron. But they took the head of Ishbosheth and buried it in the tomb of Abner in Hebron.
Matthew Henry's Commentary on 2 Samuel 4:10-12
Commentary on 2 Samuel 4:8-12
(Read 2 Samuel 4:8-12)
A person may be glad to obtain his just wishes, and yet really regret the means by which he receives them. He may be sorry for the death of a person by which he is a gainer. These men shed innocent blood, from the basest motives. David justly executed vengeance upon them. He would not be beholden to any to help him by unlawful practices. God had helped him over many a difficulty, and through many a danger, therefore he depended upon him to crown and complete his own work. He speaks of his redemption from all adversity, as a thing done; though he had many storms yet before him, he knew that He who had delivered, would deliver.