Matsya Purana — Glory of Prayaga: The Fruit of the Anashaka Fast and the Merit of the Yamuna
तत्र स्नात्वा च पीत्वा च यमुनायां युधिष्ठिर कीर्तनाल्लभते पुण्यं दृष्ट्वा भद्राणि पश्यति //
tatra snātvā ca pītvā ca yamunāyāṃ yudhiṣṭhira kīrtanāllabhate puṇyaṃ dṛṣṭvā bhadrāṇi paśyati //
O Yudhiṣṭhira, by bathing there and drinking the waters of the Yamunā, and by praising her, one gains religious merit; and having beheld her, one comes to see auspicious good fortune.
This verse is not about Pralaya; it belongs to a tirtha-mahātmya context and teaches how sacred rivers like the Yamunā confer merit through bathing, drinking, and praise.
It frames a practical dharmic duty: a householder or ruler may accrue punya through tīrtha-sevā—ritual bathing, respectful use of sacred water, and kīrtana (praise)—thereby promoting personal welfare and auspicious outcomes.
The significance is ritual rather than architectural: snāna (bathing), pāna (drinking sanctified water), and kīrtana/stuti (praise) are presented as core tīrtha practices that generate merit and auspiciousness.