《北史·列传·卷二十六》
他感到奇怪，便询问是怎么一回事，这人答道： 感谢你前天放了我，所以来报答你的恩德。 
安祖怪问之，此人云： 感君前日见放，故来谢德。 
Feeling curious, he asked what had happened. The young male replied: "I am very grateful that you let me go the other day, so I came to repay your kindness."