1 Kings 2.5

5. And also, you know that which Joab the son of Zeruiah did to me, that which he did to the two army commanders of Israel, to Abner the son of Ner, and to Amasa the son of Jether, that he murdered them, and shed the blood of war in peace, and put the blood of war on his girdle, on his loins and in his sandals on his feet;