《后汉书·列传·蔡邕列传下》
蔡邕上书申诉说： 臣被召，问的是：大鸿胪刘前为济阴太守，我的属吏张宛长休百日；刘为司隶，又托河内郡吏李奇为州书佐；及营护前河南尹羊陟、侍御史胡母班，刘都未办使我怀恨等情况。我诚惶诚恐，肝胆涂地，死无葬身之所。
初，朝议以州郡相党，人情比周，乃制婚姻之家及两州人士不得对相监临。
Cai Yong submitted an appeal to the emperor, saying: Your subject was summoned and questioned regarding the following allegations: That Liu Qian, the Grand Master of Ceremonies, when he was the Prefect of Jiyin, allowed my subordinate Zhang Wan to take a hundred days off; That Liu, when he was the Minister of Justice, requested the official Li Qi of the Hebei Commandery to serve as his assistant; That Liu protected the former Chief of Henan, Yang Zhi, and the attendant historiographer, Hu Mu Ban, and that your subject harbored ill feelings toward Liu as a result. Your subject was filled with fear and trepidation, and his heart sank into the ground. He had no place to bury himself if he died.