《论语·宪问篇》
孔子去向那三位大夫报告，但三位大夫不愿派兵讨伐，孔子又说： 因为我曾经做过大夫，所以不敢不来报告呀！ 
之三子告，不可。孔子曰： 以吾从大夫之后，不敢不告也。 
Confucius went to tell those three officials, but they refused to send troops to punish him. Confucius said again: “Because I used to be an official, I did not dare not to report it!”