成唯識論述記 7.281

7.281

述曰：此受無想處，第四靜慮，此總言也。即彼凡夫第三天處，下諸天處，其想麁動難可滅故。有變異受未可盡故。第四靜慮下二天亦然，非是凡夫下中熏習有色身處，可受殊勝無心果故。下非殊勝，故不可生，不於五淨居、無色生者，上無受無想異熟處故，謂五淨居唯聖者居，非外道所生，彼不知故，無色無身，無似彼涅槃之樂，受色身果處故。

The Commentary states: This place where the non-conceptual is experienced is the fourth dhyāna; this is a general statement. Namely, it is the third heaven of ordinary beings in that [dhyāna]. In the heavenly places below, their conceptualizations are coarse and agitated, difficult to extinguish, and feeling of change has not yet been eliminated. The lower two heavens of the fourth dhyāna are also like this: they are not places where the lower and middling habituation of ordinary beings possessing material bodies can receive the sublime mindless fruit. Because the lower is not sublime, one cannot be born there. The reason one is not born in the five Pure Abodes or the formless realm is that above there is no place to receive non-conceptual maturation. That is, the five Pure Abodes are inhabited solely by noble ones and not a birthplace for non-Buddhists, who do not know of them; and in the formless realm there is no body, no bliss resembling that nirvāṇa, and no place to receive the fruit of a material body.