Matsya Purana — Catalogue of the Eighteen Puranas
सारस्वतस्य कल्पस्य मध्ये ये स्युर्नरोत्तमाः तद्वृत्तान्तोद्भवं लोके तद्भागवतमुच्यते //
sārasvatasya kalpasya madhye ye syurnarottamāḥ tadvṛttāntodbhavaṃ loke tadbhāgavatamucyate //
That sacred narrative which arises in the world from the accounts of the best among men who lived within the Sarasvata Kalpa—this is what is called the Bhāgavata.
It does not describe Pralaya directly; it situates sacred literature within a specific Kalpa (cosmic cycle), implying that Purāṇic revelation and remembered history are organized by aeons.
By defining Bhāgavata as authoritative narrative rooted in exemplary persons, it supports the idea that kings and householders should model conduct on the lives and teachings of the ‘best among men’ preserved in Purāṇic tradition.
No Vāstu or ritual procedure is specified here; the verse is primarily a textual definition—identifying Bhāgavata as a category of sacred narrative grounded in Kalpa-based tradition.