Matsya Purana — Glory of Tīrtha-Śrāddha: Best Times
गङ्गोद्भेदस्तु गोमत्यां यत्रोद्भूतः सनातनः तथा यज्ञवराहस्तु देवदेवश्च शूलभृत् //
gaṅgodbhedastu gomatyāṃ yatrodbhūtaḥ sanātanaḥ tathā yajñavarāhastu devadevaśca śūlabhṛt //
At Gomati is the eternal place where the Gaṅgā bursts forth in manifestation. There too is the shrine of Yajña-Varāha, and also the God of gods, the trident-bearer (Śiva).
It does not describe Pralaya directly; it emphasizes sacred geography by identifying an “eternal” manifestation-point of the Ganga and associated deities, reflecting the Purāṇic view that certain tirthas remain spiritually potent across cosmic cycles.
By highlighting tirthas and deities, it supports the householder/kingly duty of honoring pilgrimage, patronizing temples, and maintaining sacred sites—acts considered merit-producing (puṇya) and socially stabilizing in Purāṇic dharma.
Ritually, it points to a tirtha where Ganga is believed to “emerge,” suitable for bathing, offerings, and deity worship; architecturally, it implies established shrines (Yajña-Varāha and Śiva) that would be prime candidates for temple patronage and careful siting near a holy water-source.