Matsya Purana — Catalogue of the Eighteen Puranas
चतुर्लक्षमिदं प्रोक्तं व्यासेनाद्भुतकर्मणा मत्पितुर्मम पित्रा च मया तुभ्यं निवेदितम् //
caturlakṣamidaṃ proktaṃ vyāsenādbhutakarmaṇā matpiturmama pitrā ca mayā tubhyaṃ niveditam //
This Purāṇa, consisting of four lakhs (four hundred thousand verses), was proclaimed by Vyāsa of wondrous deeds; it was conveyed by my father to my own father, and now I have presented it to you.
This verse does not describe Pralaya directly; it emphasizes the authority and transmission of the Purana (taught by Vyasa and handed down through a lineage) within the Matsya–Manu narrative framework often associated with the flood context.
By stressing faithful transmission of sacred knowledge, it supports the dharmic duty of rulers and householders to preserve, learn, and pass on authoritative teachings—treating scripture as a trust received from predecessors and responsibly conveyed onward.
No specific Vastu or ritual procedure is stated here; the takeaway is meta-textual: the Purana’s teachings (which elsewhere include ritual and Vastu guidelines) are presented as an authorized tradition stemming from Vyasa.