1 Kings 2:5

Moreover thou knowest also what Jo´ab the son of Zeru-i´ah did to me, and what he did to the two captains of the hosts of Israel, unto Abner the son of Ner, and unto Ama´sa the son of Jether, whom he slew, and shed the blood of war in peace, and put the blood of war upon his girdle that was about his loins, and in his shoes that were on his feet.