Matsya Purana — The Battle for Tripura: Portents
ततः स दैत्योत्तमपर्वताभो यथाञ्जसा नाग इवाभिमत्तः निवारितो रुद्ररथं जिघृक्षुर् यथार्णवः सर्पति चातिवेलः //
tataḥ sa daityottamaparvatābho yathāñjasā nāga ivābhimattaḥ nivārito rudrarathaṃ jighṛkṣur yathārṇavaḥ sarpati cātivelaḥ //
Then that foremost Daitya—mountain-like in stature—rushed straight on like a maddened elephant; intent on seizing Rudra’s chariot, he was checked, as the ocean is held back even when it surges beyond its proper shore.
It does not describe Pralaya directly; it uses the ocean’s boundary (tide-limit) as a metaphor for cosmic order—power may surge, but it is ultimately restrained by a higher regulating principle.
Through the image of restraining an over-surging ocean, the verse implicitly supports the Matsya Purana’s ethical ideal that rulers (and householders over their senses) must check violent excess and keep forces within lawful limits (maryādā).
No direct Vastu or ritual rule appears; the key takeaway is the concept of boundary (velā/maryādā), a principle that later aligns with Vastu thinking about proper limits, enclosures, and regulated space.