《资治通鉴·晋纪·晋纪二十七》
奋威将军慕容德说： 秦国强大的时候吞并了燕国，秦国软弱的时候图谋他，这是报仇雪耻，不是违背往日的心愿。哥哥你为什么得到了却不占取，放弃数万兵众而授予别人呢？ 
奋威将军慕容德曰： 秦强而并燕，秦弱而图之，此为报仇雪耻，非负宿心也；兄奈何得而不取，释数万之众以授人乎？ 
General Fengwei Murong De said: When the Qin state was strong, it annexed the Yan state. When the Qin state was weak, it plotted against him. This is revenge and shame, not against the wishes of the past. Why did you get it but not occupy it, and give up tens of thousands of soldiers to others?