四分比丘戒本疏 2.102

2.102

第八十一、無緣入王宮戒。「剎利水澆頭王種王」者，剎利是即四姓中王族也。水澆頭王種者，上祖已來昇王位時皆以水澆頭，是此王之種也。又言王者，此種之王也。謂昇位時請大婆羅門善解四韋陀者，與王為師，取四海水灌王頂上，表以吉祥統攝四海，故云灌頂王也。「未出」者，出王與婇女同歡之時，未出密室，婇女未還常居之處也。「未藏寶」者，准上有寶戒中，男以女為寶，故知婇女是王所寶。譬如七寶，此婇女寶未隱藏時，比丘輒見犯也。「門閾」者，《多論》第九，王宮外門前一限木也。有請喚命梵等難緣，不犯也。

Eighty-first, the precept on entering a royal palace without a cause. 'A kṣatriya king of the anointed-head royal lineage': 'kṣatriya' refers to the royal caste among the four castes. 'Anointed-head royal lineage' means that from his ancestors onward, whenever ascending the royal throne, they have water poured on their heads; this is the lineage of this king. Further, 'king' refers to the king of this lineage. That is, when ascending the throne, a great brahmin who understands well the four Vedas is invited to serve as the king's preceptor; he takes water from the four oceans and pours it over the crown of the king's head, symbolising the auspicious governance of the four oceans; hence he is called an 'anointed king' (mūrdhābhiṣikta). 'Not yet emerged' refers to the time when the king is enjoying himself with his court ladies and has not yet come out of the private chambers, and the court ladies have not yet returned to their usual quarters. 'Not yet hidden the treasure': according to the precept on having precious things above, a man regards a woman as a treasure; thus we know the court ladies are what the king treasures. Just as with the seven treasures, when this treasure of court ladies has not yet been concealed, a bhikṣu entering rashly commits an offence. 'Threshold of the door': in the ninth fascicle of the Sarvāstivāda-śāstra, it is a single crossbeam in front of the outer gate of the royal palace. If there are compelling conditions such as being invited, summoned, or danger to life or religious practice (brahmacarya), there is no offence.