俱舍論頌疏論本 8.31

8.31

釋曰：前七識住，兼有頂天及無想處，是名為九。諸有情類唯於此九欣樂住故，立有情居，餘處皆非，不樂住故。言餘處者，謂諸惡處，非有情類自樂居中，惡業羅剎逼之令住故，彼如牢獄，不立有情居。第四靜慮，除無想天，所餘八天非有情居，如識住釋。

The commentary states: The preceding seven stations of consciousness, together with the heaven of the peak of existence and the non-ideational realm, are designated as nine. Because sentient beings find joy and delight in dwelling only in these nine, they are established as abodes of sentient beings; all other places are not, because they do not delight in dwelling there. "Other places" refers to the various evil destinies, where sentient beings do not dwell out of their own delight, but are forced to stay by the rākṣasas of bad karma; hence, being like prisons, they are not established as abodes of sentient beings. In the fourth dhyāna, with the exception of the Non-Ideational Heaven (Asaṃjñisattva), the remaining eight heavens are not abodes of sentient beings, as explained under the stations of consciousness.