《资治通鉴·秦纪·秦纪二》
一个赵国尚且不把燕国放在眼里，更何况两个贤能的国君相互扶持，来声讨您杀害赵王的罪行啊。
夫以一赵尚易燕，况以两贤王左提右挈而责杀王之罪？
The state of Zhao alone does not take the state of Yan seriously, let alone two virtuous monarchs who support each other and come to accuse you of killing the king of Zhao.