John Gills Exposition of the Bible Commentary - 2 Samuel 3:39
And I am this day weak, though anointed king ,.... Which seems to be given as a reason, or for an excuse why he did not inflict just punishment upon the murderer, according to the law of God, because he was "weak"; not in body or mind, but with respect to the kingdom, that was like a tender branch, or in its infant state; and great care and caution were to be used that it was not overturned: he was a king by unction, not by birth; a son of the late king was yet up against him, and was... read more
Matthew Henry's Complete Commentary - 2 Samuel 3:22-39
We have here an account of the murder of Abner by Joab, and David's deep resentment of it. I. Joab very insolently fell foul upon David for treating with Abner. He happened to be abroad upon service when Abner was with David, pursuing a troop, either of Philistines or of Saul's party; but, upon his return, he was informed that Abner was just gone (2 Sam. 3:22, 23), and that a great many kind things had passed between David and him. He had all the reason in the world to be satisfied of David's... read more