宋高僧傳 19.14

19.14

次又成都府大雲寺有徐果師者，混物韜光，人罕詳測。或入三昧，不失律儀。或示狂癡，語事多中。先為衛元嵩，是難測之士，坤維間往往有人謂之徐果師。徐，姓也；果，名也；師，通稱也。此亦彊練、誌公之倫類矣，不知其終云。

Next, at Dayun Temple in Chengdu Prefecture, there was Master Xu Guo, who mingled with the mundane world and hid his brilliance, so that few people could fathom him. At times he entered samādhi without violating the vinaya rules. At other times he manifested madness, yet his predictions of affairs were mostly accurate. Earlier there was Wei Yuansong, who was a man difficult to fathom; in the southwest, people often referred to him as Master Xu Guo. "Xu" was his surname, "Guo" his given name, and "Master" a general appellation. He, too, was of the same class as Qianglian and Master Baozhi. His end is unknown.