1 Kings 2:5; 2 Samuel 3:27

Moreover, you also know what Joab the son of Zeruiah vdid to me, how he dealt with the two commanders of the armies of Israel, wAbner the son of Ner, xand Amasa the son of Jether, whom he killed, avenging1 in time of peace for blood that had been shed in war, and putting the blood of war2 on the belt around his3 waist and on the sandals on his feet.

27 And when Abner returned to Hebron, Joab took him aside into the midst of the gate to speak with him privately, pand there he struck him qin the stomach, so that he died, for the blood of Asahel his brother.