《资治通鉴·唐纪·唐纪二十一》
御史中丞魏元忠患病，郭霸去探视，亲口尝他的粪便，高兴地说： 大夫的粪便如果味甘便可忧了；现在是苦的，没有事。 
中丞魏元忠病，霸往问之，因尝其粪，喜曰： 大夫粪甘则可忧；今苦，无伤也。 
The censor Wei Yuanzhong was ill. Guo Ba went to visit him, and personally tasted his feces, and happily said: "If the doctor's feces are sweet, it will be worrying; now it is bitter, there is nothing wrong."