《资治通鉴·汉纪·汉纪十三》
单于认为是汉朝将其尊贵的使臣杀了，所以将路充国扣留匈奴，不放他回国。
单于以为汉杀吾贵使者，乃留路充国不归。
The Chanyu believed that the Han had killed its noble envoy, and so detained Lu Chongguo in the Xiongnu and would not let him return.