《资治通鉴·唐纪·唐纪八》
随即带囚犯走过，见有岐州刺史郑善果，太宗对胡演说： 郑善果虽然有罪，毕竟官衔不低，怎能让他与其他囚犯同列。
既而引囚，至岐州刺史郑善果，上谓胡演曰： 善果虽复有罪，官品不卑，岂可使与诸囚为伍。
He escorted the prisoner and saw Zheng Shanguo, the governor of Qizhou. Taizong said to Hu Yan, "Although Zheng Shanguo is guilty, he is still a high-ranking official. How can he be put in the same group as other prisoners?