四分律比丘含注戒本 2.643

2.643

(Bhikṣuṇīs commit the same offence. As for the non-offences: if one does not know; if the building is fully covered without four screens, or half-screened, or minimally screened; or fully screened without cover, half-covered, or minimally covered; or half-covered and screened, minimally covered and screened, or in the open ground. If one is sick, detained, or there is danger to life or brahmacarya, there is no offence.)