《新唐书·列传·卷二十二》
路上遇见太子千牛李志安、齐王护军李思行被押解进京师，魏徵和副使商议说： 正好有诏书，东宫和齐王府旧属一律免罪，现又捕送志安等人，谁能没有疑心呢？
道遇太子千牛李志安、齐王护军李思行传送京师，徵与其副谋曰： 属有诏，宫府旧人普原之。今复执送志安等，谁不自疑者？
On the way, they encountered Crown Prince Qian Niu Li Zhi'an and Qi Wang's bodyguards Li Sixing being escorted to the capital. Wei Zheng and the deputy envoy discussed and said: "There was an imperial edict stating that all former members of the East Palace and Qi's palace will be exempted from punishment. But now Zhi'an and others are being captured and escorted to the capital. Who can be without doubts about this?"