《论衡·卷三·初禀篇》
刘媪在大泽边休息，梦见与神仙交媾，于是生下汉高祖，可见交媾的时候就已经禀受天命了。
刘媪息於大泽，梦与神遇，遂生高祖，此时已受命也。
Liu Ao took a rest by the D澤 River, dreamed of having intercourse with a god, and then gave birth to Emperor Gaozu of the Han Dynasty. It can be seen that he had already received the mandate of heaven when they had intercourse.