When Joab came from seeing David, he sent messengers after Abner, and they brought him back from the well of Sirah; but David did not know it.
You know that Abner son of Ner came to deceive you and to know your going out and coming in and all you are doing.
And when Abner returned to Hebron, Joab took him aside to the center of the gate to speak to him privately, and there he smote Abner in the abdomen, so that he died to avenge the blood of Asahel, Joab's brother.