When Abner returned to Hebron, Joab pretended he wanted to talk privately with him. So he took Abner into one of the small rooms that were part of the town gate and stabbed him in the stomach. Joab killed him because Abner had killed Joab's brother Asahel.
The LORD replied: Lies come from the mouths of my people, like arrows from a bow. With each dishonest deed their power increases, and not one of them will admit that I am God.