2 Samuel 21:5-6

They answered, The man that consumed us, &c. They desired no reparation of private damages, or revenge of injuries; all they required was that a public sacrifice should be made to justice, and to the divine vengeance inflicted upon the land. Let seven of his sons be delivered unto us, and we will hang them up before the Lord As a satisfaction to his honour for an injustice and cruelty committed in defiance of a solemn oath given in his holy name. But it may be inquired, if Saul was thus wicked in destroying a people contrary to a solemn oath, ratified in the name of God, why should his sons and grandsons be punished for it? To this it may be answered, with great reason, and upon a good foundation, that they were not punished because Saul was guilty, but because they themselves were guilty, and had been the executioners of his unjust decrees. We have reason to conclude that his sons and his grandsons were among his captains of hundreds, and captains of thousands, as that was the practice of those days: and if so, undoubtedly they were employed in executing his cruel and unjust commands in regard to the Gibeonites, especially as the purpose of destroying them seems to have been to take their possessions; for we can scarcely suppose Saul to have been so solicitous to increase the fortunes of any, as those of his sons and grandsons. And this supposition the text before us seems to prove, as it not only entitles Saul bloody, but his house too: Saul and his bloody house. And it is likely that some of these still possessed some of the possessions of the Gibeonites, and that they defended and commended this action of Saul whenever there was any question about it: and, therefore, they very justly and deservedly suffered for it. See Delaney. In Gibeah of Saul To make the punishment more remarkable and shameful, this being the city where Saul lived both before and after he was king. Whom the Lord did choose This aggravated his guilt, that he had broken the oath of that God by whom he had been so highly favoured.

And the king said, I will give them Having doubtless consulted God in the matter; who, as he had before declared Saul's bloody house to be the cause of this judgment, so now commanded that justice should be done upon it, and that the remaining branches of it should be cut off; as sufficiently appears from hence that God was well pleased with the action; which he would not have been if David had done it without his command; for then it had been a sinful action of David's, and contrary to a double law of God. Deuteronomy 21:23; Deuteronomy 24:16.

But here another question arises; supposing Saul's sons and grandsons engaged in the fact, and therefore justly punished for it, how came it, or for what reason was it, that the whole people of Israel were afflicted with famine on that account? Undoubtedly because they were partakers too in Saul's guilt, and had been abetting, aiding, and assisting in it; or, at least, had not opposed it, as they ought to have done. It is said expressly that Saul sought to slay the Gibeonites in his zeal for the children of Israel and Judah. Is it not absurd to think that any thing was done in zeal for them which they did not approve of? Or is there much reason to doubt whether they did not lend their hand to it? Is there the least colour to believe that they in any degree remonstrated against or opposed this proceeding of their prince? as they had a right, nay, were obliged by all the laws of justice to do, as a nation bound to make good the public faith they had given, and sworn to preserve. And if this was the case, were they not guilty as well as Saul, and were they not with justice punished?