成唯識論述記 5.458

5.458

述曰：《攝論》第一論本不言為淨依故，無淨第七、法執第七。滅定、聖道、無學三位，無第七體也。

The Commentary states: The root treatise of the first fascicle of the Mahāyānasaṃgraha does not state that it is a basis for purity, and hence there is no pure seventh consciousness and no seventh consciousness with dharmagrāha. In the three states of the cessation attainment, the noble path, and the non-learner, the substance of the seventh consciousness does not exist.