《太平广记·卷二百五十二·诙谐八》
偶尔一位坐着的人问道：你既然说通晓三教，那请问释迦如来是什么人？
偶坐者问曰：既言博通三教，释迦如来是何人？
Incidentally, one of the people sitting there asked: Since you say you understand the three religions, may I ask who is the Buddha Tathagata?