《资治通鉴·汉纪·汉纪二十九》
高晖等人把使者的话转告龚胜，龚胜自己知道推辞没有用，便对高晖等人说： 我接受汉朝的厚恩，无法报答，而今年已衰老，随时都会埋入地下，从道义出发，岂可以一身而侍奉两姓君王？在地下如何面对故主？ 
晖等白使者语，胜自知不见听，即谓晖等： 吾受汉家厚恩，无以报；今年老矣，旦暮入地，谊岂以一身事二姓，下见故主哉！ 
Gao Hui and the others passed on the emissary’s words to Gong Sheng, and Gong Sheng knew that his excuse was useless, so he said to Gao Hui and the others: I received the great kindness of the Han dynasty, and there is no way I can repay it, but I am already old this year, and I could end up being buried underground at any moment; from the perspective of morality, how could I serve two lords with one body? How could I ever face my old lord in the underworld?