Matsya Purana — Genealogy of the Śūra–Vasudeva
माद्रवत्यां तु जनिताव् अश्विभ्याभिति शुश्रुम नकुलः सहदेवश्च रूपशीलगुणान्वितौ //
mādravatyāṃ tu janitāv aśvibhyābhiti śuśruma nakulaḥ sahadevaśca rūpaśīlaguṇānvitau //
We have heard that, in Mādravatī, Nakula and Sahadeva were begotten by the twin Aśvins; both were endowed with beauty, good conduct, and noble qualities.
Nothing directly—this verse is genealogical, identifying divine parentage and virtues of Nakula and Sahadeva rather than describing Pralaya.
Indirectly, it upholds the ideal of rulers/warriors possessing śīla (good conduct) and guṇa (virtues), implying that noble lineage is validated by ethical character, not merely birth.
No Vāstu or ritual procedure is stated; the verse functions as a lineage note connecting the Pandavas to the Aśvins.