俱舍論記 2.167

2.167

「但由極微至體應相糅」者，答。但由極微無間生故，彼此相擊即發得聲。若許極微相觸，擊石、拊手體應相糅合成一體，即有實物體相雜過。以己宗反難外人。

"Merely because paramāṇus ... their substances should intermingle": the reply. Merely because paramāṇus arise without interval, their striking one another produces sound. If one allows that paramāṇus touch, then when striking stones or clapping hands their substances should intermingle and fuse into a single entity, incurring the fault of physical substances intermingling into one. This uses their own school's doctrine to turn the objection back upon the opponent.