《资治通鉴·汉纪·汉纪二十一》
双方使节来往了几次之后，甘延寿、陈汤出面，责备郅支单于的使节说： 我们为了单于，不远万里来到此地，然而，一直到今天，他还没有派出一位名王、显贵，前来晋见都护将军，接受命令而供事，为什么单于对大事这么疏忽，不讲主人待客人的礼节？
使数往来相答报，延寿、汤因让之： 我为单于远来，而至今无名王、大人见将军受事者，何单于忽大计，失客主之礼也！
After several exchanges of envoys, Gan Yanshou and Chen Tang came forward and accused Zhizhi Chanyu's envoys, saying: "We have come here from thousands of miles away for the sake of the Chanyu, yet until today, he has not sent a single named prince or dignitary to meet the Protector-General, receive orders, and serve. Why is the Chanyu so negligent about important matters and dismissing the etiquette of a host receiving guests?"