Matsya Purana — Vishnu’s Battle with Mathana
अथाच्युतो ऽपि विज्ञाय दानवस्य चिकीर्षितम् वदनं पूरयामास दिव्यैरस्त्रैर्महाबलः //
athācyuto 'pi vijñāya dānavasya cikīrṣitam vadanaṃ pūrayāmāsa divyairastrairmahābalaḥ //
Then Acyuta, the Unfailing Lord, discerning the Dānava’s intent, the mighty one filled his mouth with divine missiles.
This verse does not describe pralaya directly; it highlights Vishnu (Acyuta) intervening decisively to neutralize a demonic intention—an archetypal Purāṇic motif of preserving cosmic order rather than depicting dissolution.
By analogy, it supports the dharmic duty of foresight and prevention: like Acyuta discerning an enemy’s intent, a king or householder should recognize harmful designs early and act firmly—using proportionate, lawful means—to protect people and uphold order.
No Vāstu or temple-architecture rule is stated in this verse; the ritual takeaway is symbolic—“divine astras” can be read as spiritually authorized means (mantra, discipline, righteous power) employed to restrain adharma.