《魏书·列传·卷五十》
等到李彪初登宪台，始居纠弹之职，首复引马骑卒传呼开道入宫的礼仪，订下直绳不法行为的纠弹，当时人们普遍认为这很难做到。
及其初登宪台，始居司直，首复驺唱之仪，肇正直绳之体，当时识者佥以为难。
When Li Biao first took up the post of Minister of the Censorate, to begin with he enforced the etiquette that people riding horses or in sedan-chairs should shout to clear a path when entering the palace, and he also regulated the behaviour of those who broke the law, something which people generally regarded as difficult to do.