《旧唐书·列传·卷四》
有一个法号叫桓法嗣的道士，自称善于解释占卜图书，于是呈上《孔子闭房记》，图画为一个男人手持竹竿赶羊，解释说： 隋朝，皇帝姓杨。
有道士桓法嗣者，自言解图谶，乃上《孔子闭房记》，画作丈夫持一竿以驱羊。释云： 隋，杨姓也。
There was a Taoist priest called Master Huan Fasi who claimed to be skilled at interpreting divination texts. He submitted a copy of the Records of Confucius’s Closed Room, which contained an image of a man chasing sheep with a bamboo pole. He explained: “The Sui dynasty has a surname of Yang.