《资治通鉴·齐纪·齐纪八》
自从孝文帝患病之后，彭城王元勰经常住在宫中，侍奉孝文帝看病吃药，昼夜不离其左右，凡是给孝文帝的饮食，他一定先尝一下然后才进上，如此日夜辛劳，以致蓬首垢面，衣不解带，不能好好地睡上一觉。
自魏主有疾，彭城王勰常居中侍医药，昼夜不离左右，饮食必先尝而后进，蓬首垢面，衣不解带。
Since Emperor Xiaowen fell ill, Yuan Xie, the king of Pengcheng, had often lived in the palace, serving Emperor Xiaowen with food and medicine day and night without leaving him. No matter what food was presented to Emperor Xiaowen, he would first taste it and then present it to Emperor Xiaowen. Having worked hard day and night, he looked haggard and emaciated, never took off his clothes, and could not sleep well.