俱舍論記 2.165

2.165

「若諸極微至更無細分」者，正釋無間非觸所以。若諸極微遍體相觸同為一體，即有實物物體相雜過。若觸一分不觸餘分，極微便成有細分失。唯觸一邊不觸餘處，然諸極微更無細分故不相觸，但無間住，名取至境。

"If paramāṇus ... have no further finer parts": this properly explains the reason for being without interval yet not touching. If paramāṇus were to touch throughout their entire substance and become a single entity, there would be the fault of physical substances intermingling into one. If they touched at one part and did not touch at the remaining parts, the paramāṇu would incur the fault of possessing finer parts, touching only one side and not touching elsewhere. Yet paramāṇus have no further finer parts, and therefore do not touch one another; merely abiding without interval is termed 'apprehending an arrived object.'