2 Samuel 3:22-27

22At that moment the servants of David and Joab came from a raid and brought much spoil with them. But Abner was not with David in Hebron, for he had sent him away, and he had gone in peace.

23When Joab and all the troops that were with him had come, they told Joab, saying, “Abner the son of Ner came to the king, and he sent him away, and he has gone in peace.”

24Then Joab came to the king and said, “What have you done? Look, Abner came to you; why is it that you sent him away, and he has already gone?

25Surely you realize that Abner the son of Ner came to deceive you, to know your going out and your coming in, and to know all that you are doing.”

26And when Joab had gone from David’s presence, he sent messengers after Abner, who brought him back from the well of Sirah. But David did not know it.

27Now when Abner had returned to Hebron, Joab took him aside in the gate to speak with him privately, and there stabbed him in the stomach, so that he died for the blood of Asahel his brother.