2 Samuel 3:26-28 Common English Bible (CEB)
26 Joab left David and sent messengers after Abner. They brought him back from the well at Sirah, but David didn’t know anything of this. 27 When Abner returned to Hebron, Joab took him aside next to[a] the gate to speak with him in private. But instead Joab stabbed Abner in the stomach, and he died for shedding the blood of Asahel, Joab’s brother.
28 When David heard about this later, he said, “I and my kingdom are forever innocent before the Lord concerning the shedding of the blood of Abner, Ner’s son.