Skandapurana 6.3.19.51

6.3.19.51

tato vijajñe manasā kṣaṇena anekarūpāḥ sahasā maheśā .
cakāra yanmūrtibhiravyayātmā aṣṭābhirāviśya punaḥ sa tatra .. 19.51 ..

Then in an instant, through his mind, the great lords of various forms were suddenly born; / and the imperishable Self, having pervaded there again with his eight forms, brought it about.