Matthew Henry on 2 Samuel 4:9–end
We have here justice done upon the murderers of Ish-bosheth.
I. Sentence passed upon them. There needed no evidence, their own tongues witnessed against them; they were so far from denying the fact that they gloried in it. David therefore shows them the heinousness of the crime, and that blood called for blood from his hand, who was now the chief magistrate, and was by office the avenger of blood. And, perhaps, he was the more vigorous in the prosecution because for reasons of state he had spared Joab: "Shall I not require the blood of the slain at the hand of the slayers, and, since they cannot make restitution, take theirs instead of it?" Observe, 1. How he aggravates the crime, Sa2 4:11.…
Read the whole note in the consoleJamieson-Fausset-Brown on 2 Samuel 4:8
They brought the head of Ish-bosheth unto David . . . and said, Behold the head of Ish-bosheth--Such bloody trophies of rebels and conspirators have always been acceptable to princes in the East, and the carriers have been liberally rewarded. Ish-bosheth being a usurper, the two assassins thought they were doing a meritorious service to David by removing the only existing obstacle to the union of the two kingdoms.
Adam Clarke on 2 Samuel 4:9
Who hath redeemed my soul out of all adversity - This was, in David's case, a very proper view of the goodness and watchful providence of God towards him. His life was frequently in danger; murderers had often laid wait for it: but God, the living God, had always redeemed that life from all adversity; and called on him now to punish such evil-minded and blood-thirsty men.
John Gill on 2 Samuel 4:9
And David answered Rechab and Baanah his brother, the sons of Rimmon the Beerothite,.... In a manner they did not expect:
and said unto them, as the Lord liveth, who hath redeemed my soul out of all adversity; spiritual and temporal, especially the latter is meant, and particularly what he had been brought into by the persecution of Saul, while living, and by those that adhered to his house since his death; which he ascribes to the Lord, and doubted not that he would still deliver him, and complete what he had designed for him, and that he needed not the assistance of such wicked hands as theirs; the words contain the form of an oath made to testify the truth of the following narrative, con…