《旧五代史·后唐·列传二十六》
任圜回师时，走到凤翔，朝中使者向延嗣带诏书来，于是处死康延孝。
及圜班师，行次凤翔，中使向延嗣赍诏至，遂诛之。
When Ren Yuan returned to the army, he reached Fengxiang, and the imperial messenger brought an edict to Yanshi, and then Kang Yanxiao was executed.