俱舍論疏 24.41

24.41

On the treatise passage, "The two upstream practitioners... taking birth at most seven times": This explains that before reaching Akaniṣṭha Heaven and Bhavāgra Heaven, both upstream practitioners may attain parinirvāṇa in the intermediate stages. Just as those who attain parinirvāṇa in intermediate places upon being reborn in the second, third, or fourth heavens are subsumed under intermediate traversers, even if they do not skip over stages, they are still called intermediate traversers because they traverse births.