四分律刪繁補闕行事鈔 1.266

1.266

問：今將石木為相，為取內外耶？答：若圓者，取中央，令界相正與標分相當；或取外畔。若尖斜之物，隨以一分為限。餘他物準此。應先須示知尺寸分齊，預向僧述；不得通指一山妄充外相，致令尋求分齊不可得知。

Question: When now using stones or trees as boundary marks, does one take the inside or the outside? Answer: If it is round, take the center, so that the boundary mark corresponds exactly to the marker's midpoint; or take its outer edge. If it is an object with sharp angles or slopes, take one section of it as the limit. Other objects follow this principle. One must beforehand indicate the dimensions and limits, explaining them in advance to the saṃgha; one may not vaguely point to a mountain and arbitrarily make it an external boundary mark, causing the limits to be impossible to determine upon searching.