《左传·昭公·昭公二十年》
齐豹将要发动叛乱，对宗鲁说： 公孟这个人不好，这是您所知道的，不要和他一起乘车，我将要杀死他。 
将作乱，而谓之曰： 公孟之不善，子所知也。勿与乘，吾将杀之。 
When Qi Bao was about to rebel, he spoke to Zong Lu, and said: “Gong is not a good person. You know this. Do not join him in his carriage. I will soon kill him.”