2 Samuel 3:26-28 Expanded Bible (EXB)
26 After Joab left David, he sent messengers after Abner, and they brought him back from the ·well [cistern] of Sirah. But David did not know this. 27 When Abner arrived at Hebron, Joab took him aside into ·the gateway [an inner chamber]. He acted as though he wanted to talk with Abner in private, but Joab stabbed him in the stomach, and Abner died. ·Abner had killed Joab’s brother Asahel, so Joab killed Abner to pay him back [L …on account of/to revenge the blood/killing of Asahel his brother].
28 Later when David heard the news, he said, “My kingdom and I are innocent before the Lord forever of the ·death [L blood] of Abner son of Ner.