2 Samuel 3:27-30

27And when Abner had returned to Hebron, Joab took him aside in the gate to speak with him quietly, and smote him there under the fifth rib, that he died, for the blood of Asahel his brother.1 28And afterward when David heard it, he said, I and my kingdom are guiltless before the LORD for ever from the blood of Abner the son of Ner:2 29Let it rest on the head of Joab, and on all his father’s house; and let there never cease 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.3 30So Joab and Abishai his brother slew Abner, because he had slain their brother Asahel at Gibeon in the battle.