Matsya Purana — Prologue to the Matsya Purana and the Manu–Pralaya Rescue Narrative
यदा समुद्रमखिलं व्याप्यासौ समुपस्थितः तदा प्राह मनुर्भीतः को ऽपि त्वमसुरेश्वरः //
yadā samudramakhilaṃ vyāpyāsau samupasthitaḥ tadā prāha manurbhītaḥ ko 'pi tvamasureśvaraḥ //
When he expanded to pervade the entire ocean and stood before him, the frightened Manu spoke: “Who indeed are you, O lord of the Asuras?”
It signals the approach of Pralaya through an overwhelming, ocean-filling manifestation—an early marker of the cosmic deluge setting in, before the divine identity is disclosed.
Manu’s fearful inquiry models prudent discernment in crisis: a ruler/householder should assess extraordinary events and seek truthful identification and guidance rather than act rashly.
No Vastu or ritual procedure is stated directly in this verse; its significance is narrative—establishing the Pralaya context that later frames dharma, rites, and (elsewhere in the Purana) temple/settlement guidelines.