佛說處處經 1.67

1.67

佛言：「日中後不食有五福：一者、少婬；二者、少臥；三者、得一心；四者、無有下風；五者、身安隱亦不作病。是故，沙門、道士知福不食。澡漱，有三因緣：一者、為恐爪下垢故；二者、爬痒隨可意；三者、殺蚤蚊故，亦欲使意淨無欲，復不污經此者，適可除外垢。心念惡不能除，為學人第一當淨心為本，心為法本，心正則行方，行方則應道。」

The Buddha said: 'Not eating after midday brings five benefits: first, less lust; second, less sleepiness; third, attainment of single-mindedness; fourth, no flatulence; fifth, physical well-being and freedom from illness. For this reason, śramaṇas and practitioners of the Way, knowing these benefits, do not eat. Bathing and rinsing the mouth has three purposes: first, for fear of dirt under the nails; second, scratching an itch as desired; third, killing fleas and mosquitoes. It is also intended to purify the mind, free it from desire, and avoid defiling the scriptures. These merely eliminate external dirt; they cannot eliminate evil thoughts in the mind. For a practitioner, purifying the mind must be the primary foundation. The mind is the root of the Dharma: when the mind is upright, conduct is proper; when conduct is proper, it accords with the Way.'