《汉书·传·佞幸传》
所以鲁大夫季友毒死了拥戴庆父的叔牙，《春秋》表彰了他；晋大夫赵盾从边境返回来见趟穿攻袭灵公而不讨伐逆臣，史臣说赵盾杀了国君。
是以季友鸩叔牙，《春秋》贤之；赵盾不讨贼，谓之弑君。
Therefore, Ji You, the official of Lu, poisoned Shu Ya, who supported Qingfu, and the "Spring and Autumn" praised him; Zhao Dun, the official of Jin, returned from the border and saw Tang Chuang attack Linggong without punishing the rebel minister. The historian said Zhao killed the monarch.