俱舍論記 25.70

25.70

「如是無間至非增上故」者，釋頌無漏。此據無間及解脫道，言唯無漏；若依加行，通有漏、無漏。故《婆沙》六十八云「彼加行道或有漏、或無漏。」《正理》亦云「一切加行皆通二種。」

"Such uninterrupted... because it is not superior" explains "uncontaminated" in the verse. This is according to the uninterrupted paths and liberation paths, which are said to be solely uncontaminated; as for the preparatory path, it extends to both contaminated and uncontaminated. Hence the Vibhāṣā says in fascicle 68: "Its preparatory path is either contaminated or uncontaminated." The Nyāyānusāra also states: "All preparatory paths extend to both kinds."