Shàng qīng jiǔ zhēn zhōng jīng nèi jué 上清九真中經內訣

Inner Instructions on the Shàng qīng Nine-Perfected Central Scripture

attributed to 赤松子 (Chì sōng zǐ)

An early-Six-Dynasties Shàng qīng 上清 esoteric-instruction text on the Jiǔ zhēn zhōng jīng 九眞中經 — a core Shàng qīng meditation-scripture on the Nine Perfected (jiǔ zhēn 九眞). Attributed to the legendary rain-master Chì sōng zǐ. Preserved as DZ 908 / CT 908 (Dòngshén bù, Zhòng shù lèi 洞神部眾術類).