Matsya Purana — Cosmic Creation: Emergence of the Great Elements and the Navel-Lotus
*मत्स्य उवाच आपवः स विभुर्भूत्वा चारयामास वै तपः छादयित्वात्मनो देहं यादसां कुलसंभवम् //
*matsya uvāca āpavaḥ sa vibhurbhūtvā cārayāmāsa vai tapaḥ chādayitvātmano dehaṃ yādasāṃ kulasaṃbhavam //
Lord Matsya said: Having become mighty and masterful, that Āpava indeed undertook austerities; concealing his own body, he assumed an origin within the lineage of the aquatic beings (yādasa).
This verse does not describe Pralaya directly; it focuses on a lineage-origin motif—how a figure (Āpava) uses tapas and concealment to appear as arising within an aquatic (yādasa) clan.
Indirectly, it highlights tapas (disciplined self-restraint) as a source of power and legitimacy—an ethical theme often applied in Purāṇic guidance for rulers and householders, even though no explicit royal duty is stated here.
No Vāstu, temple-building rule, or explicit ritual procedure is stated in this verse; its key takeaway is the ascetic (tapas) and identity-concealment motif within a genealogical narrative.