《北史·列传·卷二十三》
厨师把真情告诉王劭，王劭依照过去模样，闭目思考，出其不意地抓住了偷肉吃的人，厨师这才免去受处罚和鞭打，他专心到这样的程度。郑道邕，字孝穆。少年时谨慎诚实，以清廉节约自居，年龄不满二十，就阅读了大量经史典籍。
子道邕。道邕字孝穆。幼谨厚，以清约自居，年未弱冠，涉历经史。
The cook told Wang Shao what was happening, and Wang Shao sat closed-eyed in thought as usual, and unexpectedly caught the person who was stealing and eating the meat. Only then was the cook spared from punishment and whipping. He was so devoted to his studies. Zheng Daoyong, courtesy name Xiaomu. From a young age, he was prudent and honest, and he made a point of being clean and frugal. Before he was twenty years old, he had read many historical and classical works.