Matsya Purana — Catalogue of the Eighteen Puranas
इदं पवित्रं यशसो निधानम् इदं पितॄणामतिवल्लभं च इदं च देवेष्व् अमृतायितं च नित्यं त्विदं पापहरं च पुंसाम् //
idaṃ pavitraṃ yaśaso nidhānam idaṃ pitṝṇāmativallabhaṃ ca idaṃ ca deveṣv amṛtāyitaṃ ca nityaṃ tvidaṃ pāpaharaṃ ca puṃsām //
This teaching/recitation is holy—a treasury of good renown; it is exceedingly dear to the Ancestors (Pitṛs); and among the gods it is as amṛta itself, the nectar of immortality. Truly, it ever removes the sins of human beings.
This verse does not describe pralaya directly; it teaches that a specific sacred recitation/teaching is perpetually purifying and “nectar-like” to the gods, emphasizing spiritual merit rather than cosmological dissolution.
It supports the Matsya Purana’s ethical-religious ideal that daily or regular recitation and observance of purifying teachings sustains personal virtue, brings good repute (yaśas), and benefits one’s lineage by pleasing the Pitṛs—relevant to both a ruler’s public dharma and a householder’s nitya-karma.
Architectural rules are not mentioned; the ritual takeaway is that this practice is “pavitra” and “pāpahara,” and is specially pleasing to Pitṛs and Devas—indicating strong suitability for rites connected to purification and ancestral satisfaction.