Matsya Purana — Solar Dynasty Prelude: Vivasvān–Saṃjñā–Chāyā
अश्वरूपेण महता तेजसा च समावृतः संज्ञा च मनसा क्षोभम् अगमद्भयविह्वला //
aśvarūpeṇa mahatā tejasā ca samāvṛtaḥ saṃjñā ca manasā kṣobham agamadbhayavihvalā //
Enveloped in a great, blazing radiance, he appeared in the form of a horse; and Saṃjñā, terrified, became inwardly shaken and mentally agitated.
This verse does not describe Pralaya directly; it highlights divine tejas (overwhelming radiance) and transformation, a recurring Purāṇic motif used to explain how cosmic power affects embodied beings.
Indirectly, it frames the Solar lineage narrative (connected to Manu traditions) and teaches restraint and discernment: overwhelming power (tejas) can destabilize the mind, so householders and rulers should cultivate steadiness and self-control.
No Vāstu or ritual procedure is stated in this verse; its key takeaway is the concept of tejas—important in iconography and ritual theory as the ‘radiant potency’ associated with deities and consecrated forms.