Matsya Purana — Glory of Prayaga: The Fruit of the Anashaka Fast and the Merit of the Yamuna
अग्नितीर्थमिति ख्यातं यमुनादक्षिणे तटे पश्चिमे धर्मराजस्य तीर्थं तु नरकं स्मृतम् //
agnitīrthamiti khyātaṃ yamunādakṣiṇe taṭe paścime dharmarājasya tīrthaṃ tu narakaṃ smṛtam //
On the southern bank of the Yamunā there is a sacred ford renowned as Agni-tīrtha. And on the western side lies Dharma-rāja’s holy place, remembered by the name Naraka-tīrtha.
This verse does not discuss pralaya; it maps sacred geography by naming specific tīrthas on the Yamunā’s banks and associating them with deities (Agni and Dharma-rāja).
Indirectly, it supports dharma through tīrtha-yātrā: rulers and householders are encouraged in Purāṇic ethics to honor sacred places, perform purificatory bathing, and uphold moral order symbolized by Dharma-rāja (Yama).
The ritual significance is tīrtha-snānā (bathing at a sacred ford) and pilgrimage orientation—identifying where particular deity-associated tīrthas are located (south/west of the Yamunā), guiding traditional rites rather than temple architecture.