觀無量壽佛經義疏 2.57

2.57

"'Ānanda! You must receive and retain this, and proclaim the Buddha's words widely for the multitude. The Tathāgata now teaches Vaidehī and all sentient beings of future generations to contemplate the Western World of Sukhāvatī.'" Because Ānanda was foremost in learning, he exhorted him to retain and speak it. Since they were in the secluded palace, those who heard it together were few; intending that he recount it later when returning to Gṛdhrakūṭa, he therefore entrusted it beforehand. "The Tathāgata now" and so on are all words of entrustment spoken to Ānanda. Second, accomplishing practice according to the teaching.