四分律刪補隨機羯磨 1.166

1.166

（時諸比丘，有須四人眾羯磨事起，五人眾、十人眾、二十人眾羯磨事起。是中大眾集會疲極，佛言：「聽結戒場，稱四方界相，若安栓、若石、若標畔，作齊限已。」《毘尼母》云：「必以大界圍遶。」《五分》等律須在大界前結。若欲作者，先安三重標相：內裏一重，名戒場外相；中間一重，名大界內相；最外一重，名大界外相。立三相已盡，自然界內僧集，在戒場標內，先令一比丘唱戒場外相，應作如是言：）

(At that time, when bhikṣus had matters requiring a four-person saṃgha karman arise, or matters requiring a five-person, ten-person, or twenty-person saṃgha karman arise, the great assembly among them was exhausted by assembling. The Buddha said: "I allow [you] to bind a platform for precepts, proclaiming the boundary markers of the four directions—whether by setting stakes, stones, or marked borders, establishing the demarcations." The Vinayamātṛkā states: "It must be surrounded by a mahāsīmā." Vinayas such as the Mahīśāsaka state that it must be bound before the mahāsīmā. If one wishes to make it, first set three tiers of boundary markers: the inner tier is called the outer markers of the platform for precepts; the middle tier is called the inner markers of the mahāsīmā; the outermost tier is called the outer markers of the mahāsīmā. After all three markers are set, the bhikṣus within the natural boundary assemble, and inside the markers of the platform for precepts, first have one bhikṣu proclaim the outer markers of the platform for precepts, who should speak thus:)