四分律比丘含注戒本 2.247

2.247

尼等吉羅。不犯者，不共期，大伴行，疑恐怖處，若往彼得安隱，若力勢所持，命、梵等難者，並開。

For bhikṣuṇīs and others, it is a duṣkṛta. Non-offences: if they did not make an appointment together; if traveling in a large caravan; in places of suspicion and dread; if going there allows safety; if restrained by physical force; or during dangers to life or celibacy—all are permitted.