8 They brought the head of Ishbosheth to David to Hebron, and said to the king, “Behold, the head of Ishbosheth, the son of Saul, your enemy, who sought your life! Yahweh has avenged my lord the king this day of Saul, and of his seed.”
9 David answered Rechab and Baanah his brother, the sons of Rimmon the Beerothite, and said to them, “As Yahweh lives, who has redeemed my soul out of all adversity, 10 when someone told me, ‘Behold, Saul is dead,’ thinking to have brought good news, I took hold of him, and killed him in Ziklag, which was the reward I gave him for his news. 11 How much more, when wicked men have slain a righteous person in his own house on his bed, shall I not now require his blood of your hand, and take you away from the earth?” 12 David commanded his young men, and they killed them, and cut off their hands and their feet, and hanged them up beside the pool in Hebron. But they took the head of Ishbosheth, and buried it in the grave of Abner in Hebron.
Matthew Henry's Commentary on 2 Samuel 4:8-12
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.