《太平广记·卷一百六十五·廉俭（》
卖主说：我自己都不知道它是银的，拿到市场出售，你给足了钱，并不是强买去的，我不敢收回来。
彼曰：某自不识珍奇，鬻于街肆。郎中厚加酬直，非强买也，不敢复收。
The seller said, "I didn't know it was silver myself. I sold it in the market, you paid the full price, and you didn't force me to sell it, so I dare not take it back."