佛說觀佛三昧海經 2.41

2.41

“If after my parinirvāṇa the Buddha’s disciples abandon all evils, leave behind noisy bustling states, delight in the Dharma of few words, do not busy themselves with many affairs, and during the six periods of the day and night can, during one period—or dividing that one period into a fraction, and within that fraction, for even a moment—mindfully contemplate the Buddha’s white ūrṇā so that their mind is lucid, free of mistaken or confused thoughts, abiding clearly and correctly, maintaining their focus without ceasing to contemplate the white ūrṇā, whether they see its marks or cannot see them, such persons will eradicate the sins of birth and death spanning ninety-six billion nayutas of Ganges sands of dust-mote kalpas.