《后汉书·列传·朱冯虞郑周列传》
今料此反虏，势不能久全，贼内部必有人斩贼首。
今度此反虏，势无久全，其中必有内相斩者。
I estimate that this rebel will not be able to complete the whole thing for long, and someone in the enemy's interior must have beheaded the thief.