《资治通鉴·晋纪·晋纪二十九》
后燕国主慕容垂对各位将领说： 翟辽只不过凭借着一个城池的部众，却在三个国家之间反复归叛，不能不去讨伐。 
燕主垂谓诸将曰： 辽以一城之众，返覆三国之间，不可不讨。 
The ruler of the Later Yan state, Murong Chui, said to his generals: “Di Liao relies on the people of one city to repeatedly betray and rebel against three different states. I have no choice but to conquer him.”