俱舍論疏 23.192

23.192

論「以不生長至俱清淨故」，答也。「以不生長退墮業故」者，不造新引惡趣業也。「違彼生長業與果故」者，舊招惡趣不定業者不能與果，若有定業不得預流。「強盛善根鎮彼身故」者，無漏業也。「加行意樂俱清淨故」者，得不作戒也。

The treatise says, "Because they do not generate... both are pure." This is the answer. "Because they do not generate karma that falls" means they do not create new karma that leads to bad destinies. "Because it is contrary to that generated karma granting its fruit" means that past indeterminate karma that would incur bad destinies cannot give its fruit; if determinate karma were present, one would not attain stream-entry. "Because powerful wholesome roots subdue their bodily continuity" refers to undefiled karma. "Because preparation and intention are both pure" refers to obtaining the restraint of non-action.