Teaching Assistant to the Tang Imperial Academy Zhang Jian was from Koushi in Henan. He once gave a lecture at a provincial school on ‘Selected Literature’. A fox sprite took on Jian’s form, delivered a lecture on a book, and then departed. When Jian arrived soon after, his pupils were bewildered and asked him about it. Jian was surprised and said: “The former must have been a fox sprite.” He cancelled the lecture and returned to his rooms. He saw his younger sister sitting winding silk, and she spoke to Jian: “The food I have just cooked is cold; why has elder brother come so late?” Jian seated himself but after waiting for a long time his food still didn’t arrive. He reproached his sister, but she said: “I didn’t see you arrive in the first place; it must have been that fox sprite. If we see it again, kill it!” He came back the next day. He saw his younger sister sitting winding silk, and she spoke to Jian: “The demon has just gone behind the rooms.” Jian took up a cudgel. He saw his real younger sister emerging from the toilet, and attacked her. His sister screamed “It’s me!” Jian did not believe her, and he beat her to death. When he went to ask the silk-winder, she immediately turned into a fox and departed.
From Chaoye qianzai.
Li Fang 李昉, et al., Taiping guangji 太平廣記 (Extensive Gleanings from the Era of Great Harmony), 10 vols (Beijing: Zhonghua shuju, 1961), ix, 447.3658: