佛說觀佛三昧海經 4.41

4.41

佛告阿難：「此臍相中略而解之，佛心境界後自當說。如是觀者名為正觀，若異觀者名為邪觀。佛滅度後佛諸弟子，思是法者、持是法者、觀是法者，此人現世惡業罪障皆悉清淨。

The Buddha told Ānanda: “Within this mark of the navel, I have briefly explained it; the realm of the Buddha’s mind will be spoken of naturally later. One who contemplates in this way is termed one who practices right contemplation; if one contemplates otherwise, it is termed wrong contemplation. After the Buddha’s parinirvāṇa, if the Buddha’s disciples reflect upon this Dharma, uphold this Dharma, and contemplate this Dharma, the evil karma and sinful obstructions of these persons in the present life will all become completely pure.”