《资治通鉴·汉纪·汉纪六十》
因此，魏王曹操的训诲刚刚送来，曹植的答辞就已经送去。曹操对这样迅速的回答觉得很奇怪，经过追问，真相才泄露出来，此外，曹操还因为杨是袁术的外甥而厌恶他，因此便公布了他多次泄漏魏王训诲，交结诸侯的罪状，把他抓起来杀了。
操亦以修袁术之甥，恶之，乃发修前后漏泄言教，交关诸侯，收杀之。
As a result, as soon as the Wei King Cao Cao’s instructions were delivered, Cao Zhi’s responses were sent out. Cao Cao found the speed of the response odd, and only after inquiring into the matter did the truth come out. Moreover, Cao Cao was disgusted by Yang’s having been a nephew of Yuan Shu, so he published his crimes, which included repeatedly leaking the Wei King’s instructions and consorting with the feudal lords, and had him arrested and executed.