《论衡·卷二十六·知实篇》
颜渊饶火做饭，灰尘掉到饭甑里，想放开它不管饭就不干净了，想把有灰的饭倒掉就要糟踏一些饭，所以就把它挑出来吃了。孔子远远地看见了，认为颜渊是在偷饭吃。
颜渊炊饭，尘落甑中，欲置之则不清，投地则弃饭，掇而食之。孔子望见以为窃食。
Yan Yuan cooked food in the fire and ashes fell into the steamer. He thought that if he left it alone the food would not be clean, but if he poured out the rice that had ashes in it, some rice would be wasted, so he picked it out and ate it. Confucius saw him from a distance and thought that Yan Yuan was stealing food.