《史记·七十列传·乐毅列传》
乐毅心里明白燕惠王派人代替自己是不怀好意的，害怕回国后被杀，便向西去投降了赵国。
乐毅知燕惠王之不善代之，畏诛，遂西降赵。
Yue Yi knew that Yan Huiwang's action of sending people to replace him was not friendly, he was afraid of being killed after returning to his country, so he fled west to surrender to the Zhao country.