《史记·七十列传·匈奴列传》
郭吉到了匈奴，匈奴主客询问他出使的任务，郭吉谦卑施礼，说了些好话，说： 我见到单于再亲口对他说。 
郭吉既至匈奴，匈奴主客问所使，郭吉礼卑言好，曰： 吾见单于而口言。 
After Guo Ji arrived in the Xiongnu, the Xiongnu's guests and hosts asked him about the mission of his envoy, Guo Ji respectfully bowed and said some nice words, saying: "I will tell the Chanyu in person when I see him."