Matsya Purana — Hiranyakashipu’s Boons
विमलैः स्फाटिकाभैश्च पाण्डुरच्छदनैर्द्विजैः बहुहंसोपगीतानि सारसाभिरुतानि च //
vimalaiḥ sphāṭikābhaiśca pāṇḍuracchadanairdvijaiḥ bahuhaṃsopagītāni sārasābhirutāni ca //
There, spotless, crystal-bright birds with pale-white plumage are seen; the place resounds with the songs of many swans and with the calls of sarasa-cranes as well.
This verse is not about Pralaya; it describes auspicious environmental signs—pure, bright birds and harmonious natural sounds—used to praise or identify a sacred locale.
It supports the practical ethic of choosing and maintaining pure, auspicious surroundings—especially near water sources—for settlement, pilgrimage support, and religious life, a concern for both rulers (public sacred works) and householders (clean, sattvic habitat).
In Vastu-oriented site assessment, the presence of serene water-birds like swans and sarasa-cranes and pleasing soundscape functions as a शुभ-लक्षण: a favorable indicator for tīrtha/temple precincts and for ritual purity of the environment.