《史记·七十列传·范雎蔡泽列传》
须贾就在门口等着，拽着马缰绳等了很长时间不见人来，便问门卒说： 范叔进去很长时间了不出来，是怎么回事？ 
须贾待门下，持车良久，问门下曰： 范叔不出，何也？ 
Xu Jia waited at the gate, holding the horse reins and after a long time no one came out, and so he asked the gatekeeper: It has been a long time since Fan Shu went in and he has not come out, why is that?