《论衡·卷十七·指瑞篇》
世人看到武王诛灭纣王，出行时遇上白鱼、赤乌，就说上天用白鱼、赤乌来授命武王诛灭纣王，事情有点相象，但实际上并不是这么回事。
世见武王诛纣，出遇鱼、乌，则谓天用鱼、乌命使武王诛纣，事相似类，其实非也。
People said that Heaven used the white fish and red birds to authorize Wu Wang to kill King Zhou, since they saw Wu Wang killed King Zhou and he met white fish and red birds on his way out. Things look similar, but in fact things are not that way.