《资治通鉴·汉纪·汉纪五十七》
刘备过了很久才察觉情况不对，派遣亲信去问刘琮，刘琮命令属官宋忠去向刘备传达旨意。
备久之乃觉，遣所亲问琮，琮令其官属宋忠诣备宣旨。
Liu Bei first noticed something was wrong when it was too late, and sent a trusted aide to ask Liu Zhong, who detailed his subordinate Song Zhong with the task of delivering the imperial edict to Liu Bei.