Matsya Purana — Characteristics of Dvāpara and Kali Yugas
प्रगृहीतायुधैर्विप्रैः शतशो ऽथ सहस्रशः स तदा तैः परिवृतो म्लेच्छान्सर्वान् निजघ्निवान् //
pragṛhītāyudhairvipraiḥ śataśo 'tha sahasraśaḥ sa tadā taiḥ parivṛto mlecchānsarvān nijaghnivān //
Then, surrounded by Brahmins who had taken up weapons—by the hundreds and even by the thousands—he proceeded at that time to strike down all the mlecchas.
This verse does not describe Pralaya; it depicts a dharmic conflict scenario where armed Brahmins assist in eliminating disruptive mleccha forces, emphasizing protection of order rather than cosmic dissolution.
It reflects the Rajadharma principle that society must be protected from violent disruption; even those normally devoted to ritual learning (vipras) may, in exceptional circumstances, support the restoration of dharma—implying that rulers and communities must prevent adharma from spreading.
No Vastu/temple-architecture or specific ritual procedure is stated here; the focus is martial protection and the safeguarding of dharmic society.