Once Confucius took his students on an outing. While cooking at noon, when the rice was about to be cooked, Confucius saw Yan Hui grabbing the rice from the pot with his hands and eating it. It happened that Confucius walked into the kitchen, thinking that he was stealing food, so he gave him a lesson and said: "Just now, the ancestors of Meng and Li told me that food must be presented to the elders before eating. How can I eat it myself first?" Yan Hui heard this and hurriedly said He explained: "The teacher misunderstood. I saw soot falling into the pot just now, so I picked up the dirty rice and ate it.

Confucius, who learned the truth, said with emotion: "What I saw with my own eyes is not accurate, let alone what I heard from hearsay."