四分律刪繁補闕行事鈔 2.429

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五無梵行難。謂若有童女寡婦、伏藏、水陸多細蟲、同住多惡伴，如此之事，並是犯緣。文云：若在此住，必為我淨行作留難。佛言：即以此事去。準此以言，對下三篇；體是威儀。不開性戒。就遮戒中，或是遮惡、或是事輕、或以輕遮重；若不開者，反上可知。《毘尼母》云：犯罪有三：一緣，二制，三重制。一緩一急，三處決斷，是名律師。

Fifth: being free from danger to celibacy. That is to say, if there are maidens, widows, hidden treasures, abundant tiny insects on land or water, or many evil companions living together—such matters are all conditions for violation. The text states: 'If I dwell here, it will surely obstruct my pure practice.' The Buddha said: 'Depart immediately because of this matter.' According to this, it refers to the lower three classes; their essence is deportment. Natural precepts are not allowed [to be broken]. Among the prohibitory precepts, some are to prohibit evil, some concern minor matters, and some use what is minor to prevent what is grave; if they are not allowed, the opposite of the above can be known. The Vinayamātṛkā states: 'Offenses have three aspects: first, the circumstance; second, the prohibition; third, the repeated prohibition. Discriminating between the relaxed and the strict across these three places—this is called a Vinaya master.'