Matsya Purana — The Greatness of Prayaga: Manasa Tirtha
शतं वर्षसहस्राणां सोमलोके महीयते तस्मादपि परिभ्रष्टो राजा भवति धार्मिकः //
śataṃ varṣasahasrāṇāṃ somaloke mahīyate tasmādapi paribhraṣṭo rājā bhavati dhārmikaḥ //
For a hundred thousand years he is honored in the Moon-world (Somaloka); and even when he falls from there, he is reborn as a righteous king.
This verse does not describe pralaya; it teaches karmic results—merit leading to residence in Somaloka and subsequent rebirth—showing the Purana’s moral cosmology rather than cosmic dissolution.
It frames righteous conduct (dharma) as producing both heavenly honor and an auspicious rebirth as a dhārmika rājā, reinforcing that ethical governance and household virtue yield long-term spiritual and social outcomes.
No direct vastu/temple-architecture rule appears here; the verse is focused on the afterlife reward (Somaloka) and the moral consequence of dharma.