四分律刪繁補闕行事鈔 1.283

1.283

二不得受欲者，具有三義：一結界是眾同之本，理宜急制。二自然界弱，不勝羯磨，此《僧祇》正文。三令知界畔，護夏別眾護食護衣等。《十誦》云：作羯磨比丘死，餘人不知界處，佛令捨已更結。故須盡集。

Second, regarding not being permitted to receive chanda, there are three reasons: First, demarcating the boundary is the foundation of the saṃgha's harmony, and in principle it ought to be strictly prohibited. Second, the natural boundary is weak and cannot support the karman—this is the explicit text of the Mahāsāṃghika-vinaya. Third, it enables them to know the boundary borders to guard against [transgressions during] the summer retreat, separate saṃgha, guarding food, guarding robes, and so forth. The Daśādhyāya-vinaya states: When the bhikṣu who performed the karman died and the others did not know the location of the boundary, the Buddha instructed that it be relinquished and demarcated anew. Therefore, all must be assembled.