《资治通鉴·唐纪·唐纪二十三》
裴怀古想自己轻装骑马前往抚慰，身边的下属对他说： 夷獠之徒不讲信用，您不能麻痹大意。 
怀古轻骑赴之。左右曰： 夷獠无信，不可忽也。 
Pei Huigu wanted to go alone on horseback to appease them. A subordinate by his side said to him: "The Yi and Liao barbarians are not trustworthy, and you must not let your guard down."