Matsya Purana — Purūravas Witnesses the Sports of Apsarases and Gandharvas; Attains the Grace...
एवम् अप्सरसां पश्यन् क्रीडितानि स पर्वते तपस्तेपे महाराजन् केशवार्पितमानसः //
evam apsarasāṃ paśyan krīḍitāni sa parvate tapastepe mahārājan keśavārpitamānasaḥ //
Thus, even while watching the playful sports of the Apsarases, he performed austerities upon the mountain, O great king, with his mind wholly offered to Keśava (Viṣṇu).
This verse does not describe Pralaya directly; it highlights inner discipline—remaining steady in austerity and devotion even amid distracting, alluring sights.
It presents a model of self-mastery: even when surrounded by pleasures, one should keep the mind dedicated to God (Keśava) and uphold dharma—an ethical ideal equally relevant to rulers and householders.
No Vāstu or temple-rule detail appears here; the ritual takeaway is the principle of tapas supported by bhakti—offering the mind to Keśava while performing disciplined practice.