四分律比丘含注戒本 2.253

2.253

For bhikṣuṇīs and others, it is a duṣkṛta. Non-offences: if there was no appointment; if crossing directly to the opposite bank; if upon entering the boat the boatman loses control of the crossing and goes upriver or downriver; if going to the opposite bank would not be safe; or if restrained by physical force; or during conditions of danger to life or celibacy—there is no offence.