Matsya Purana — Glory of Prayaga: The Fruit of the Anashaka Fast and the Merit of the Yamuna
अवगाह्य च पीत्वा च पुनात्यासप्तमं कुलम् प्राणांस्त्यजति यस्तत्र स याति परमां गतिम् //
avagāhya ca pītvā ca punātyāsaptamaṃ kulam prāṇāṃstyajati yastatra sa yāti paramāṃ gatim //
By bathing there and also drinking that sacred water, one purifies one’s lineage up to the seventh generation. And whoever gives up his life there attains the supreme destination.
This verse does not discuss Pralaya; it focuses on tirtha-mahātmyā—spiritual merit gained through bathing and drinking sacred water, and the belief that dying at such a place leads to the highest spiritual state.
It supports the householder ethic of accruing puṇya through tīrtha practices (snāna, pāna) and benefiting one’s ancestors/lineage; it frames pilgrimage and ritual purity as socially and spiritually constructive duties.
Ritually, it emphasizes snāna (immersion) and pāna (drinking) at a consecrated water-site; while not architectural, it indirectly underlines why tīrthas are maintained with ghāṭas, wells, and water-access structures in Purāṇic religious culture.