《隋书·列传·卷二十七》
柳彧从外面进来，见杨素这样，就在台阶下面拿着笏，整整衣冠，对杨素说： 奉圣旨给你治罪。 
彧从外来，见素如此，于阶下端笏整容谓素曰： 奉敕治公之罪。 
Liu Yu came in from outside and saw Yang Su like this, so he took a tablet under the steps, tidied up his clothes, and said to Yang Su: I will punish you according to the imperial edict.