《资治通鉴·唐纪·唐纪三十》
快到了平卢，史干先派人对军使裴休子说： 奚王派琐高带领精兵都来了，声言入朝，实际上是想袭击军城，应该早为防备，先下手为强。 
窣干将至平卢，先使人谓军使裴休子曰： 奚使琐高与精锐俱来，声云入朝，实欲袭军城，宜谨为之备，先事图之。 
About to arrive at Ping lu, Shi Gan sent someone to tell the military envoy Pei Xiou zi, “Xi King sent Luo Gao to lead an elite army to come. They claim to pay homage to the emperor, but in reality, they want to attack the military city. We should prepare for defense, and strike first.”