2 Samuel 20:10; 2 Samuel 20:23

10 Amasa didn’t notice the dagger in his left hand, and Joab stabbed him in the stomach with it so that his insides gushed out onto the ground. Joab did not need to strike again, and Amasa soon died. Joab and his brother Abishai left him lying there and continued after Sheba.
23 Now Joab was the commander of the army of Israel. Benaiah son of Jehoiada was captain of the king’s bodyguard.