Matsya Purana — The Greatness of Prayaga and Allied Tirthas
य इदं शृणुयान्नित्यं तीर्थं पुण्यं सदा शुचिः जातिस्मरत्वं लभते नाकपृष्ठे च मोदते //
ya idaṃ śṛṇuyānnityaṃ tīrthaṃ puṇyaṃ sadā śuciḥ jātismaratvaṃ labhate nākapṛṣṭhe ca modate //
Whoever, ever pure, listens daily to this sacred and meritorious account of the tīrtha gains remembrance of past births and rejoices upon heaven’s summit.
This verse is a phalaśruti about the merit of daily listening to a sacred tīrtha account; it does not directly discuss pralaya, but emphasizes spiritual results (puṇya, heaven, heightened memory) gained through śravaṇa.
It supports the dharmic discipline of nitya-śravaṇa (regular hearing of sacred lore) and śauca (purity), practices recommended for householders and rulers alike to cultivate merit, clarity of mind, and auspicious destiny.
The ritual emphasis is śravaṇa (listening) performed nityam with śuci (purity); no specific Vāstu or temple-construction rule is stated in this verse.