2 Samuel 3:26-30 - Joab Murders Abner
26 Joab left David. Then he sent messengers to get Abner, and they brought him back from Sirah Well. David knew nothing about it. 27 Abner arrived in Hebron. Joab took him aside at the gate, as though he wanted to speak privately with him. There he stabbed him in the stomach. So Abner was murdered because he had killed Joab's brother Asahel.
28 When David heard the news, he said: Jehovah knows that my subjects and I are completely innocent of the murder of Abner. 29 Let the punishment for it fall on Joab and all his family! In every generation may there be some man in his family who has gonorrhea or a dreaded skin disease or is fit only to do a woman's work or is killed in battle or does not have enough to eat! 30 Joab and his brother Abishai took revenge and murdered Abner for killing their brother Asahel in the battle at Gibeon.