Tiāntóng Rújìng (天童如淨; Japanese: Tendō Nyōjo) was a Caodong Buddhist monk living in Qìngdé Temple (慶徳寺; Japanese: Keitoku-ji) on Tiāntóng Mountain (天童山; Japanese: Tendouzan) in Yinzhou District, Ningbo. He taught and gave dharma transmission to Sōtō Zen founder Dōgen as well as early Sōtō monk Jakuen (寂円 Jìyuán).
According to Keizan, when Ruijing became a leader, he didn't put himself above the other monks. He wore the black surplice and robe of a monk. He was given a purple vestment of honor by the emperor of China, but he declined it. Even after reaching enlightenment, he was willing to clean the bathroom.
- Ferguson, Andrew E. (2000). Zen's Chinese Heritage: The Masters and Their Teachings. Wisdom Publications. p. 454. ISBN 978-0861711635.
- Warner, Brad (May 2007). Sit Down and Shut Up. New World Library. p. 10. ISBN 1-57731-559-6.
- Keizan, Jōkin. Transmission of Light. ISBN 0-86547-433-8.
- "Caodong Family Tree". caodongzazen.com. Retrieved May 17, 2012.
- (in Chinese) 略述天童如净禅师的生平与禅学思想 a summary of some sources about Rujing
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