Matsya Purana — Narasimha’s Victory over Hiraṇyakaśipu and the Catalogue of Apocalyptic Omens
महेन्द्रस्तोयदैः सार्धं सहस्राक्षो महाद्युतिः महता तोयवर्षेण शमयामास पावकम् //
mahendrastoyadaiḥ sārdhaṃ sahasrākṣo mahādyutiḥ mahatā toyavarṣeṇa śamayāmāsa pāvakam //
Then Mahendra—Sahasrākṣa, the great-lustrous Indra—together with the rain-bearing (clouds), quenched the fire by a mighty downpour of water.
It does not describe Pralaya directly; it portrays cosmic regulation—fire (Agni) is restrained by rain under Indra’s agency—illustrating how the universe is maintained by balancing elemental forces.
By analogy, it models righteous governance: just as Indra suppresses destructive fire with timely rain, a king or householder should quell harmful excess (conflict, greed, disorder) through appropriate, measured action that restores stability.
No direct Vastu or temple-rule instruction appears here; indirectly, it reflects a ritual-ecological idea common in Purāṇas—rain as a purifying, pacifying force used in rites to cool/appease fiery energies (Agni) and avert calamity.