四分律刪繁補闕行事鈔 1.305

1.305

《善見》云：戒場上，不得立房。縱使王立，有慚愧比丘剔壞；餘材草送住寺比丘。唯置佛殿及樹木也。外國戒場多在露地，如世祭壇郊祀之所，故律中或名戒壇。《五百問》中：受戒值天雨，若移戒場屋下者，先解大界，更結戒場及結大界方得。解三小界，同前結法。

The Samantapāsādikā states: 'On the precept platform, no rooms may be erected. Even if a king erects them, bhikṣus who possess shame and conscience must dismantle them; the remaining timber and grass are sent to the bhikṣus residing in the monastery. Only a Buddha hall and trees may be placed there.' In foreign countries, precept platforms are mostly in open ground, like secular altars for sacrificial worship in the suburbs; hence in the Vinaya it is sometimes called a precept altar. In the Wubai wen: 'If rain is encountered during ordination, if one is to move the precept platform under a roof, one must first dissolve the great boundary, and then re-demarcate the precept platform and demarcate the great boundary before it is valid.' The dissolution of the three small boundaries follows the previous demarcation procedure.