Chen Sibai (陳司敗) is either the name of an unknown person or means the Minister of Crime for the state of Chen. In Chapter XXX of Book 7 of the Analects, he attempts to put Confucius on the spot with a loaded question about Duke Zhao of Lu.
Appearances in the Analects of Confucius
Book 7, Chapter XXX
Chen Sibai asked: “Did Duke Zhao understand the rites?” Confucius said: “Yes, he understood the rites.” Confucius withdrew. With a bow, Chen invited Wuma Qi to come forward and said to him: “I have heard it said that a true leader is never biased. But isn’t your master biased after all? The Duke took a wife from the state of Wu, but since she belonged to his own clan he changed her name to Wu Mengzi. If the Duke understood the rites, who doesn’t understand them?” Wuma Qi reported this to Confucius. Confucius said: “I am fortunate indeed: whenever I make a mistake, there is always someone on hand to let me know about it.”