《庄子·杂篇·徐无鬼》
徐无鬼经过商女的引荐见到了魏武候，武候慰劳徐无鬼说： 先生一定十分疲惫吧？而且是受隐居山林的劳累所困苦，所以才肯来拜访我。 
徐无鬼因女商见魏武侯，武侯劳之曰： 先生病矣，苦于山林之劳，故乃肯见于寡人。 
Xu Wu Gui was introduced to Duke Wu of Wei by Shang Nu. Duke Wu consoled Xu Wu Gui and said, "Master must be very tired, and you are also distressed by the hardship of living in seclusion in the mountains, which is why you have deigned to visit me.”