《后汉书·列传·杨震列传》
后来有冠雀衔了三条鱼，飞栖讲堂前面，主讲老师拿着鱼说： 蛇，是卿大夫衣服的象征。
后有冠雀衔三鳣鱼，飞集讲堂前，都讲取鱼进曰： 蛇鳣者，卿大夫服之象也。
Later, a crested sparrow held three fish in its mouth and flew to the front of the lecture hall. The teacher held the fish and said: Snake, a symbol of the clothes worn by the high officials.