《论衡·卷十九·验符篇》
唐尧、虞舜的时候，各种野兽都欢舞，当今也有八条龙游玩嘻戏了很长时间。
唐、虞之时，百兽率舞，今亦八龙遨戏良久。
During the time of Tang Yao and Yu Shun, all kinds of beasts danced happily, and today eight dragons have been playing and frolicking for a long time.