2 Samuel 3:27

3:27 When Abner returned to Hebron, Joab took him aside at the gate as if to speak privately with him. Joab then stabbed him in the abdomen and killed him, avenging the shed blood of his brother Asahel.

2 Samuel 23:18

23:18 Abishai son of Zeruiah, the brother of Joab, was head of the three. He killed three hundred men with his spear and gained fame among the three.