佛說觀佛三昧海經 4.41

4.41

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.”