Revākhaṇḍa ascribed to the Vāyupurāṇa (RKV) 19.51

19.51

tato vijajñe manasā kṣaṇena anekarūpāḥ sahasā maheśā /
cakāra yanmūrtibhir avyayātmā aṣṭābhir āviśya punaḥ sa tatra //

Then from his mind, in an instant, the great lords of manifold forms suddenly arose,
which the imperishable soul created, having again entered there with eight forms.