Shabuhragan
The Shabuhragan (Persian: شاپورگان Shāpuragān), which means "[the] book of Shapur", was a sacred book of the Manichaean religion, written by the founder Mani (c. 210–276 CE) himself, originally in Middle Persian, and dedicated to Shapur I (c. 215-272 CE), the contemporary king of the Sassanid Persian Empire. The book was designed to present to Shapur an outline of Mani's new religion, which united elements from Zoroastrianism, Christianity, and Buddhism. Original Middle Persian fragments were discovered at Turpan, and quotations were brought in Arabic by Biruni:
Sources
Manicheism English translations of portions of the Shabuhragan can be found here.
Middle Persian Sources: D. N. MacKenzie, “Mani’s Šābuhragān,” pt. 1 (text and translation), BSOAS 42/3, 1979, pp. 500-34,, copy at the Internet Archive. pt. 2 (glossary and plates), BSOAS 43/2, 1980, pp. 288-310 , copy at the Internet Archive.