四分律行事鈔資持記 2.2125

2.2125

三十，標中。本是僧法，由界僧少，次開二位。就下二位，皆是別法；但事儀有別，故兩分之。

Under the thirty [niḥsargika-pāyattika], the heading: It was originally a Saṅgha procedure, but due to a shortage of monks in the boundary, two subsequent positions were opened. Regarding the lower two positions, both are individual procedures; but because their ritual protocols differ, they are divided into two.