佛說觀佛三昧海經 4.18

4.18

佛告阿難：「佛滅度後，佛諸弟子作是觀者，常聞百億千佛及諸菩薩說眾妙法不壞耳根。如是觀者名為正觀，若異觀者名為邪觀。

The Buddha told Ānanda: "After the Buddha's parinirvāṇa, any of the Buddha's disciples who make this contemplation will constantly hear hundreds of koṭis of thousands of Buddhas and bodhisattvas expounding the wondrous Dharma, without their faculty of hearing ever deteriorating. Such contemplation is called right contemplation; if one contemplates otherwise, it is called wrong contemplation.