四分律行事鈔資持記 1.1273

1.1273

《五分》中。受同諸部，捨法獨異。彼約得衣日去，數滿四月；事同安居，前減後增，竝通一月。問：何以異耶？答：準詳諸部，皆開四月；但是宗計，各見不同。《五分》則取受衣為始；《四分》以迦提常開，不在其數。若據八月十五受者，不妨《四分》，還成四月；《五分》却得五月，思之可解。

In the *Mahīśāsaka-vinaya*: reception is the same as in the various schools, but the method of relinquishment is uniquely different. That text counts a full four months starting from the day the robe is obtained; as with the rains retreat, decreasing in front and increasing behind, both extend over one month. Question: Why is there a difference? Answer: Examining the various schools, all grant four months; but these are tenets of the schools, and their views differ. The *Mahīśāsaka-vinaya* takes the reception of the robe as the beginning; the *Dharmaguptaka-vinaya* regards the kārttika period as constantly open, not included in that number. If it is received on the fifteenth day of the eighth month, it does not prevent the *Dharmaguptaka-vinaya* from still making four months; the *Mahīśāsaka-vinaya* on the contrary gets five months; this can be understood through reflection.