Matsya Purana — Purūravas Witnesses the Sports of Apsarases and Gandharvas; Attains the Grace...
एवमस्त्वित्यथोक्तस्तैः स तु राजा पुरूरवाः तत्रोवास सुखी मासं पूजयानो जनार्दनम् //
evamastvityathoktastaiḥ sa tu rājā purūravāḥ tatrovāsa sukhī māsaṃ pūjayāno janārdanam //
They replied, “So be it.” Thereupon King Purūravas stayed there happily for a month, worshipping Janārdana (Viṣṇu).
This verse does not discuss pralaya directly; it emphasizes sustained devotional worship and disciplined residence, a recurring Purāṇic ideal even across cosmic cycles.
It presents a king’s model conduct: accepting counsel (“so be it”), remaining steady in one place, and dedicating time to worship—showing that royal life should be anchored in dharma and devotion, not mere power.
The ritual takeaway is the extended observance—staying for a month while worshipping Viṣṇu—suggesting a sustained vrata/arcana period rather than a one-time rite, consistent with Purāṇic temple and household worship practice.