四分律比丘含注戒本 2.766

2.766

若初入村門，犯墮。一足入內，及方便、共期，一切吉羅。尼同犯。不犯者，若營僧、塔、病事，囑授比丘。若道由村過，啟白，若喚請，命、梵等難緣，無犯。

If one first crosses the village gate, one commits a falling offense [prāyaścittika]. Stepping one foot inside, as well as the preliminary action and mutual agreement, are all duṣkṛta. The bhikṣuṇīs commit the same offense. As for non-offense: if one manages affairs of the saṃgha, a stūpa, or the sick, having informed a bhikṣu; if the road passes through the village and one makes an announcement; or in the event of an invitation, summons, or dangers to life or pure conduct, there is no offense.