佛說觀佛三昧海經 4.18

4.18

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.