Matsya Purana — Narasimha’s Victory over Hiraṇyakaśipu and the Catalogue of Apocalyptic Omens
नागास्तेजोधराश्चापि पातालतलचारिणः हिरण्यकशिपुर्दैत्यस् तदा संस्पृष्टवान्महीम् //
nāgāstejodharāścāpi pātālatalacāriṇaḥ hiraṇyakaśipurdaityas tadā saṃspṛṣṭavānmahīm //
The Nāgas—radiant bearers of power—who move about in the subterranean realms of Pātāla, and the Daitya Hiraṇyakaśipu as well, at that time came into contact with (i.e., pressed upon/affected) the Earth.
It does not directly describe Pralaya; it highlights Purāṇic cosmology where underworld beings (Nāgas/Daityas) can physically impact the Earth, implying a layered universe with interactions across realms.
Indirectly, it frames the Earth as a realm influenced by powerful forces; in the Purāṇic ethic, this supports the king’s duty to protect stability and uphold dharma amid disruptive powers (āsuric or subterranean).
No explicit Vāstu or ritual rule appears in this verse; its takeaway is cosmographic—Pātāla and Nāga traditions that sometimes inform temple iconography (Nāga motifs) rather than construction procedure.