2 Samuel 3:24-27

24So Joab went to the king and said, “What have you done? Look, Abner came to you. Why did you dismiss him? Now he is getting away! 25Surely you realize that Abner son of Ner came to deceive you and to track your movements and all that you are doing.”

26As soon as Joab had left David, he sent messengers after Abner, who brought him back from the well of Sirah. But David was unaware of it.

27When Abner returned to Hebron, Joab pulled him aside into the gateway, as if to speak to him privately, and there Joab stabbed him in the stomach. So Abner died on account of the blood of Joab’s brother Asahel.