It is said that Sonkei, his mentor at Mt. Hiei, appreciated Nichiko's broad scholarship and presented him a fragment of Murasaki kesa (purple robe for Buddhist priest), which was in connection with Saicho and was a temple treasure.
比叡山での師尊契は日珖の広い学識に感じて最澄ゆかりの神宝である紫袈裟を切って贈ったという。