Matsya Purana — Description of Pralaya: Drying
कश्चैव पुरुषो नाम किंयोगः कश्च योगवान् असौ कियन्तं कालं च एकार्णवविधिं प्रभुः //
kaścaiva puruṣo nāma kiṃyogaḥ kaśca yogavān asau kiyantaṃ kālaṃ ca ekārṇavavidhiṃ prabhuḥ //
Who indeed is that ‘Person’ by name? What is ‘Yoga’? And who is that Yogin? O Lord, for how long (does it last), and what is the prescribed procedure concerning the single cosmic ocean (ekārṇava)?
It frames pralaya as an ekārṇava—an all-encompassing single ocean—and asks for its rule/procedure and duration, indicating a technical cosmological account rather than a purely poetic flood description.
Manu’s questioning models dharmic leadership: a king seeks precise knowledge of cosmic law (time, method, and discipline like yoga) to govern ethically and prepare society for cycles of change.
No direct Vāstu or temple rule is stated; the verse instead sets a ritual-philosophical frame by asking for the ‘vidhi’ (prescribed method) concerning pralaya and yogic understanding.