《新唐书·列传·卷七十九》
朱滔、王武俊在赵州围攻康日知，李抱真分出两千兵守卫邢州，马燧发怒，想收兵回去，李晟说： 我们三个元帅，奉皇帝的命令东讨叛贼，邢州与赵州相邻，现在叛贼攻打赵州，这样邢州很快也不得安宁，李公分兵守卫，也不算错，您怎么就急着退兵呢？ 
硃滔、王武俊围康日知于赵州也，抱真分兵二千戍邢，燧怒，欲班师。晟曰： 奉诏东讨者，吾三帅也。邢、赵比壤，今贼以兵加赵，是邢有昼夜忧，李公分众守之，不为过，公奈何遽引去！ 
Zhu Tao and Wang Wujun besieged Kang Rizhi in Zhao Prefecture. Li Baozhen assigned 2,000 soldiers to defend Xingzhou. Ma Sui was furious and wanted to withdraw his troops. Li Sheng said, "The three of us are the marshals. By the order of the emperor, we led troops to the east to attack the rebels. Xingzhou and  zhao zhou are adjacent to each other. Now that the rebels are attacking Zhao zhou, Xingzhou will soon be in danger. Li's troops are defending the city. It's not a big deal. Why are you in a hurry to retreat?"