俱舍論疏 28.88

28.88

The Śāstra says: "The attainment called pure... [this obtains the name 'pure']," which secondly explains the pure concentration (śuddhaka). "Because it is defiled (sāsrava), it is distinct from the uncorrupted (anāsrava)"—this is qualified by the term "mundane" (laukika). Because it is pure, it is not relishing; this is qualified by the term "wholesome." "Because it is associated with white dharmas such as non-greed, it is called pure," which explains the name "pure."