《资治通鉴·汉纪·汉纪二十九》
使者只好奏报： 现在正值盛夏，天气酷热，龚胜有病，缺少气力，是不是可以等到秋季凉爽时再动身？ 
使者上言： 方盛夏暑热，胜病少气，可须秋凉乃发。 
The emissary had no choice but to report: It is currently the height of summer, and the weather is extremely hot, and Gong Sheng is sick and lacks strength; can you wait until the weather is cooler in the fall to leave?