Matsya Purana — Manvantaras
तैः शिष्टैश्चलितो धर्मः स्थाप्यते वै युगे युगे त्रयी वार्त्ता दण्डनीतिः प्रजावर्णाश्रमेप्सया //
taiḥ śiṣṭaiścalito dharmaḥ sthāpyate vai yuge yuge trayī vārttā daṇḍanītiḥ prajāvarṇāśramepsayā //
By those śiṣṭas, the Dharma that has been set in motion is indeed re-established age after age—through the Vedic triad (trayi), through vārttā (productive livelihood and economy), and through daṇḍanīti (the science of punishment and governance)—so that the people may be guided toward the proper order of varṇa and āśrama.
It does not describe Pralaya directly; instead, it emphasizes continuity across yugas—Dharma is repeatedly restored through Vedic authority (trayī), economic order (vārttā), and governance (daṇḍanīti).
It frames a king’s core duty as maintaining Dharma through daṇḍanīti (just punishment and administration) while supporting vārttā (stable livelihood and economy) and honoring Vedic norms—so society remains aligned with varṇa and āśrama duties.
No specific Vāstu or temple-building rule is stated; the ritual anchor is trayī (Vedic learning/ritual tradition), presented as one of the pillars by which Dharma is re-established.