佛祖統紀 4.25

4.25

佛告憍陳如。阿難何在。陳如答言。在娑羅林外。去此大會十二由旬。為六萬四千億魔之所嬈亂。是諸魔眾悉自變身為如來像宣說一切諸法示現神通。阿難念言。如是神變將非佛所作邪。阿難入魔羂故。極受大苦。以是因緣不來至此。佛告文殊。阿難吾弟。給事我來二十餘年。所可聞法具足受持。喻如瀉水置之一器。是故我今顧問何在。欲令受持是涅槃經。今為諸魔所惱。汝持是大陀羅尼可往救護。文殊受已至阿難所。魔王聞呪。悉發菩提心捨於魔業。即放阿難歸至佛所（涅槃經）。

The Buddha addressed Kauṇḍinya: 'Where is Ānanda?' Kauṇḍinya replied: 'He is outside the Sāla forest, twelve yojanas from this great assembly, harassed by sixty-four thousand billion demons. These multitudes of demons have all transformed their bodies into the form of the Tathāgata, preaching all dharmas and displaying spiritual penetrations. Ānanda thought, "Could such spiritual transformations not have been done by the Buddha?" Because Ānanda has fallen into the snare of the demons, he is suffering extreme distress. For this reason he has not come here.' The Buddha said to Mañjuśrī: 'Ānanda is my younger brother. He has served me for more than twenty years, and fully receives and upholds whatever Dharma he hears, like pouring water from one vessel into another. For this reason I now inquired where he was, wishing to have him receive and uphold this Nirvāṇa Sūtra. Now he is being tormented by demons; you should take this great dhāraṇī and go rescue and protect him.' Having received it, Mañjuśrī went to Ānanda's place. When the demon king heard the dhāraṇī, he gave rise to the bodhimind, abandoned demonic deeds, and immediately released Ānanda to return to the Buddha's place (Nirvāṇa Sūtra).