《资治通鉴·后晋纪·后晋纪四》
谏议大夫郑元弼劝谏说： 古时候刑不上大夫。中丞是掌握百官刑罚制度的人，怎能对他打板子！ 
谏议大夫郑元弼谏曰： 古者刑不上大夫，中丞仪刑百僚，岂宜加之棰楚！ 
Zheng Yuanbi, the Censor-in-chief, advised: In ancient times, the刑punishment did not apply to officials of the大夫rank. The Censor-in-chief is the person who is in charge of the 刑罚 regulations for all officials, how can he be beaten with a stick!