2 Samuel 3:26-30 - Joab Murders Abner
26 And, when Joab had come out from David, he sent messengers after Abner, and brought him back from the well of Sirah, - but, David, knew it not. 27 So Abner returned to Hebron, and Joab took him aside into the midst of the gate, to speak with him quietly, - and then smote him there, in the belly, that he died, for the blood of Asahel the brother of Joab.
28 And, when David heard of it, after that, he said - Guiltless, am I and my kingdom before Yahweh, unto times age-abiding, - of the blood of Abner son of Ner. 29 Let it be hurled upon the head of Joab, and against all his father's house, - and let there not fail from the house of Joab - one that hath an issue, or a leper, or one that leaneth on a crutch, or that falleth by the sword, or that lacketh bread. 30 Thus, Joab and Abishai his brother, slew Abner, - because he had caused the death of Asahel their brother, in Gibeon, in the battle.