《隋书·列传·卷十三》
武帝大怒，命令左右将其斩首。杨素理直气壮地说： 我给无道的天子做事，死是应该的。 
至于再三，帝大怒，命左右斩之。素乃大言曰： 臣事无道天子，死其分也。 
Emperor Wu was furious and ordered his subordinates to behead him. Yang Su said with a righteous look: I worked for the ruthless emperor and deserved to die.