10 when someone told me, 'Saul is dead,' and thought he was bringing good news, I seized him and put him to death in Ziklag. That was the reward I gave him for his news! 11 How much more-when wicked men have killed an innocent man in his own house and on his own bed-should I not now demand his blood from your hand and rid the earth of you!" 12 So David gave an order to his men, and they killed them. They cut off their hands and feet and hung the bodies by the pool in Hebron. But they took the head of Ish-Bosheth and buried it in Abner's tomb at 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.