俱舍論記 9.7

9.7

「彼居本有至業所遮故」者，答。地獄本有亦不恒燒，如暫遊彼十六增時而不被燒，況在中有，或如等活暫遇涼風、或稱等活暫時歇息亦不恒燒。設許能燒，如母眼不見亦不可觸，以中有身極微細故，火亦應爾。諸趣中有雖居一腹，微細義同，非互觸燒，業所遮故。准此，母腹亦不被燒，業所遮故。

Regarding the passage: "When abiding in the basic existence... obstructed by karma": Answer: Even in the basic existence of hell, one is not constantly burning, just as when temporarily visiting the sixteen additional hells one is not burned, let alone in the intermediate state; or just as in Saṃjīva when temporarily encountering a cool breeze, or in accordance with the name "Saṃjīva" when temporarily resting, one is also not constantly burning. Even granted that it could burn, just as the mother's eyes cannot see it and it cannot be touched because the body of the intermediate state is extremely subtle, fire should also be like this. Although the intermediate states of the various destinies reside in a single belly, they share the same subtlety and do not touch or burn one another, because they are obstructed by karma. By this principle, the mother's womb is also not burned, because it is obstructed by karma.