《旧唐书·本纪·卷十七》
一次侍讲学士许康佐对皇帝谈到，割取蟒蛇胆，必须是将活蟒蛇的腹部剖开去割取，皇帝听后为之伤感。
帝与侍讲学士许康佐语及取蚺蛇胆，生剖其腹，为之恻然。
Once, Xu Kangzuo, a scholar in charge of the imperial lectures, told the emperor that in order to extract the gall of a python, the belly of a live python had to be cut open to extract it, and the emperor felt sorry for him after hearing it.