俱舍論記 24.116

24.116

「論曰至後容退故」者，不動種姓諸羅漢盡智無間後必起無生智；非盡智後更有盡智，無學正見無間而生。除不動法，餘五阿羅漢，盡智無間後，或有盡智生。或即引生無學正見，非無生智，後容退故。

"The treatise says [...] because they may subsequently fall back" means: For arhats of the unshakeable lineage (akopya-dharman), immediately after the knowledge of destruction, the knowledge of non-arising (anutpādajñāna) necessarily arises; it is not that another knowledge of destruction follows the knowledge of destruction, but the right view of an adept (aśaikṣa-samyagdṛṣṭi) arises immediately [after it]. Except for the unshakeable-dharma, for the other five types of arhats, immediately after the knowledge of destruction, another knowledge of destruction may arise, or it directly induces the right view of an adept; it is not the knowledge of non-arising, because they may subsequently fall back.