1 Kings 2:5

‘And also, thou hast known that which he did to me — Joab son of Zeruiah — that which he did to two heads of the hosts of Israel, to Abner son of Ner, and to Amasa son of Jether — that he slayeth them, and maketh the blood of war in peace, and putteth the blood of war in his girdle, that [is] on his loins, and in his sandals that [are] on his feet