Thematic Bible: Against abner by joab

So Joab approached the king and asked him, "What have you done? Look, Abner came to you! What's this? You sent him away? He's long gone now! You know Ner's son Abner came to mislead you, to learn your troop movements, and to learn everything you're doing!" As soon as Joab left David, Joab sent messengers after Abner, and they brought him back from the cistern at Sirah, but David was not aware of this. read more.
When Abner returned to Hebron, Joab brought him aside within the gateway to talk to him alone and then stabbed him in the abdomen. So he died for shedding the blood of Joab's brother Asahel.