勸發菩提心集 3.69

3.69

《文殊問般若經》云：六時不聲：禮佛時、聽法時、眾和合時、吃食時、正食時、大小便時。何故？如是天清淨心為聞法故，以彼聲故，心不得定故，諸天還以天去故，惡鬼來作不饒益事。

The *Mañjuśrīparipṛcchā-prajñāpāramitāsūtra* states: At six times one should make no sound: when paying homage to the Buddha, when listening to the Dharma, when the Saṅgha gathers in harmony, when eating, while actually dining, and when defecating or urinating. Why? Because the devas have pure minds to hear the Dharma; on account of that sound, their minds cannot attain concentration, so the devas return to heaven, and evil spirits arrive to cause disadvantageous harm.