When David heard it, he said, I and my kingdom are guiltless Josephus says, he lifted up his hands to God, and, with a loud voice, cried out publicly that God knew he was innocent in this matter; and therefore he trusted God would not let him and his kingdom suffer for it. And on all his father's house David's indignation at the fact transported him much too far in making him wish that all Joab's family might suffer for it, which was contrary to the law of God. See Deuteronomy 24:16. “Methinks,” says Henry, “a resolute punishment of the murderer himself would better have become David than this passionate imprecation of God's judgments upon his posterity.” But, perhaps, the words are to be considered as a prediction rather than as an imprecation. Accordingly, Houbigant renders them, but it shall or will rest upon the head of Joab, and on all his father's house, and there will not fail, &c.
Related Commentaries of 2 Samuel 3:28
2 Samuel 3:28-29
28 And afterward when David heard it, he said, I and my kingdom are guiltless before the LORD for ever from the bloodf of Abner the son of Ner:
29 Let it rest on the head of Joab, and on all his father's house; and let there not failg from the house of Joab one that hath an issue, or that is a leper, or that leaneth on a staff, or that falleth on the sword, or that lacketh bread.