Yuanshi Five Lao Chishu Yupian Zhenwen Tianshu Jing. Also known as "Dongxuan Lingbao Red Book True Text". The author is unknown, probably from the Eastern Jin Dynasty. It is the first sutra of the ancient Lingbao Sutra. Originally composed of two volumes, it was later divided into three volumes. Original source: "Orthodox Taoist Canon" Dongzhenbu text genre. Reference copy: Dunhuang manuscript No. S.5733.
