2 Samuel 20:10; 2 Samuel 20:23

10 But Amasa did not observe the sword that was in Joab's hand. So Joab struck him with it in the stomach and spilled his entrails to the ground without striking a second blow, and he died. Then Joab and Abishai his brother pursued Sheba the son of Bichri.
23 Now Joab was in command of all the army of Israel; and Benaiah the son of Jehoiada was in command of the Cherethites and the Pelethites;