四分律行事鈔資持記 3.1076

3.1076

不犯中，初開屏處。下下，簡後戒。即單提中，第八十六戒；律因六群尼，與男子入闇室，故制。若比丘尼與男子共入闇室中者，波逸提。彼從譏過，不約染心故也。

Under exceptions, the opening provides an exception for a concealed place. Below that, it distinguishes this from a later precept. That is the eighty-sixth precept among the bare pāyattikas. In the Vinaya, the Buddha instituted it because the bhikṣuṇīs of the group of six entered a dark room with a man: 'If a bhikṣuṇī enters a dark room together with a man, it is a pāyattika.' That rule arises from the fault of inviting censure, and does not depend on a defiled mind.