Matsya Purana — Procedure for Going to Prayaga and the Greatness of the Ganga
धनधान्यसमायुक्तो दाता भवति नित्यशः भुक्त्वा तु विपुलान्भोगांस् तत्तीर्थं लभते पुनः //
dhanadhānyasamāyukto dātā bhavati nityaśaḥ bhuktvā tu vipulānbhogāṃs tattīrthaṃ labhate punaḥ //
Endowed with wealth and grain, one becomes a constant giver. And after enjoying abundant pleasures, one attains that very sacred tīrtha again.
This verse does not describe pralaya directly; it teaches karma-phala: generosity leads to prosperity and repeated access to sacred merit, implying continuity of moral causation across lives rather than cosmic dissolution.
It frames the ideal gṛhastha/king as a sustained donor: maintaining resources (wealth and grain) not merely for enjoyment but for continual giving, which yields both worldly enjoyment and lasting religious merit.
The ritual emphasis is on tīrtha-sevā and dāna: supporting sacred places and acts of giving; while no Vāstu rule appears, it supports the broader ritual economy that sustains temples and pilgrimage sites.