1 Kings 2:5

“Moreover you know also what Joab the son of Zeruiah did to me, even what he did to the two captains of the armies of Israel, to Abner the son of Ner and to Amasa the son of Jether, whom he killed, and shed the blood of war in peace, and put the blood of war on his sash that was around his waist and in his sandals that were on his feet.