律戒本疏 1.129

1.129

七十六諸比丘聞亂諍訟默然立聽作是念諸比丘所說我當憶持犯墮　十七群與六群諍已。十七群屏處共語。更相謂言。六群比丘匈健惡聞。若我等同心彼不能得便。六群盜聽。聽已便勵聲變色。責十七群比丘。因制不得默聽他語。若聞墮。不聞突。若好若惡悉不得盜聽。盜聽悉墮。防諍緣故。若和合若行遇聞悉無犯。

76. When monks hear confused disputes and quarrels, standing in silence to listen, thinking: 'Whatever the monks say, I shall remember and hold,' is an offense of pāyattika. After the saptadaśavargika group quarreled with the ṣaḍvargika group, the saptadaśavargika group spoke together in a secluded place, saying to one another: 'The ṣaḍvargika monks are fierce, vigorous, and ill-reputed; if we are of one mind, they will not be able to take advantage of us.' The ṣaḍvargika eavesdropped. Having listened, they raised their voices, changed their countenance, and rebuked the saptadaśavargika monks. Because of this, it was proscribed to listen silently to others' speech. If one hears, it is a pāyattika; if one does not hear, a duṣkṛta. Whether good or bad, one is completely forbidden to eavesdrop; all eavesdropping is a pāyattika, in order to prevent causes of dispute. If in harmony, or if one hears accidentally while walking, in all cases there is no offense.