《史记·七十列传·孟尝君列传》
曾经得到魏子赠粮的那位贤人听说了这件事，就上书给湣王申明孟尝君不会作乱，并请求以自己的生命作保，于是在宫殿门口刎颈自杀，以此证明孟尝君的清白。
魏子所与粟贤者闻之，乃上书言孟尝君不作乱，请以身为盟，遂自刭宫门以明孟尝君。
The virtuous man who had received the grain from Wei Zi heard about this and submitted a document to King Min stating that Lord Mengchang would not rebel and requesting to vouch for this with his own life, which he then proceeded to do by cutting his own throat at the gate of the palace to prove Lord Mengchang's innocence.