俱舍論疏 8.186

8.186

論「若復不誦至何名中般」，第四經也。五種不還中既別標中般，故知中有決定非無。

On the passage in the śāstra from "If they also do not recite" to "what is called entering nirvāṇa in the intermediate state?": This is the fourth sūtra. Since among the five kinds of non-returners (anāgāmin), "one who enters nirvāṇa in the intermediate state" (antarāparinirvāyin) is distinctly designated, we know that intermediate existence definitely exists.