Matsya Purana — Nārāyaṇa as Haṃsa in the Cosmic Ocean: Vedic Yajña-Puruṣa and Mārkaṇḍeya’s Vi...
*श्रीभगवानुवाच अहं नारायणो ब्रह्मन् सर्वभूतविनाशनः अहं सहस्रशीर्षाख्यो यः पदैरभिसंज्ञितः //
*śrībhagavānuvāca ahaṃ nārāyaṇo brahman sarvabhūtavināśanaḥ ahaṃ sahasraśīrṣākhyo yaḥ padairabhisaṃjñitaḥ //
The Blessed Lord said: “O Brahman, I am Nārāyaṇa, the One who brings about the dissolution of all beings. I am He who is called ‘the Thousand-Headed One’, renowned in the sacred verses (padas).”
It identifies Nārāyaṇa as the cosmic power responsible for dissolution—Pralaya is presented as an act under the Supreme Lord’s sovereignty, not a random catastrophe.
By stressing a single supreme ruler of cosmic order, it implies that kings and householders should govern and live in alignment with dharma, recognizing that worldly power is subordinate to divine law and impermanence.
No direct Vāstu or temple rule is stated; ritually, the verse supports Vishnu/Nārāyaṇa-centered recitation and contemplation (pada/vedic-verse remembrance) as a theological basis for worship and iconographic identification with the cosmic Purusha.