成唯識論述記 1.416

1.416

述曰：又破自性。由此三事，即大等故，應如大等轉變非常。故立量云：薩埵等三法，應轉變無常；即大等故；如大等法。恐有能別不極成過及無同喻過，故以轉變之言簡也。

The Commentary states: This again refutes prakṛti. Since these three entities are identical to mahat and so forth, they should transform and be impermanent just like mahat and so forth. Therefore, the syllogism is established: The three entities, sattva and the rest, should be transforming and impermanent; because of being identical to mahat and so forth; like mahat and other principles. Lest there be the fault of an unestablished predicate (aprasiddha-viśeṣaṇa) and the fault of lacking a shared example, it is qualified with the word "transformation" (pariṇāma).