2 Samuel 3:24

Abner said to David, “I will arise and go, and will gather all Israel to my lord the king, that they may make a covenant with you, and that you may reign over all that your soul desires.” David sent Abner away; and he went in peace.

Behold, David’s servants and Joab came from a raid and brought in a great plunder with them; but Abner was not with David in Hebron, for he had sent him away, and he had gone in peace.

When Joab and all the army who was with him had come, they told Joab, “Abner the son of Ner came to the king, and he has sent him away, and he has gone in peace.”

You know Abner the son of Ner. He came to deceive you, and to know your going out and your coming in, and to know all that you do.”

When Joab had come out from David, he sent messengers after Abner, and they brought him back from the well of Sirah; but David didn’t know it.

When Abner had returned to Hebron, Joab took him aside into the middle of the gate to speak with him quietly, and struck him there in the body, so that he died for the blood of Asahel his brother.