成唯識論述記 8.414

8.414

述曰：界、趣、生等皆有衰朽，非中夭者，臨終異前根、識衰朽，故是遍趣，得立為支。除中夭者，顯不定故。《瑜伽》第十三云：問云：何應知上界有差？答：彼諸行有朽壞腐敗性故，正與此同。

The Commentary states: Realms, destinies, and births all have decay and deterioration. For those who do not die prematurely, their sense faculties and consciousness decay and deteriorate near death, distinct from before; therefore, it is pervasive across the destinies and can be established as a factor. Excluding those who die prematurely indicates that it is not definite. The thirteenth fascicle of the Yogācārabhūmi asks: "How should one know that there is deterioration in the higher realms?" It answers: "Because those formations possess the nature of decay and rot," which accords precisely with this.