TiÃÂntóng Rújìng (天童å¦Âæ·¨; Japanese: Tendà  Nyojà Â) (1163âÂÂ1228) was a Caodong Buddhist monk living in Jìngdé Temple (æ¯徳寺; Japanese: Keitoku-ji) on TiÃÂntóng Mountain (天童山; Japanese: Tendà Âzan) in Yinzhou District, Ningbo. He taught and gave dharma transmission to Sà Âtà  Zen founder Dà Âgen as well as early Sà Âtà  monk Jakuen (å¯Âå Jìyuán).
His teacher was Xuedou Zhijian (éªç«ÂæºéÂÂ, 1105âÂÂ1192), who was the sixteenth-generation dharma descendant of Huineng.
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.
He is traditionally the originator of the terms shikantaza and shinjin-datsuraku ("casting off of body and mind").