俱舍論記 28.149

28.149

「無漏與染至故三有別」者，簡差別。無漏與染必不相生，極相違故。淨俱相生。在中間故，故三有別。

"The anāsrava and the defiled ... hence the three are distinct" distinguishes the differences. The anāsrava and the defiled never produce one another, because they are diametrically opposed. The pure produces both, because it stands in the middle; hence the three are distinct.