Matsya Purana — Cosmography of Jambūdvīpa: Varṣas
देवलोकच्युतास्तत्र जायन्ते मानवाः शुभाः शुक्लाभिजनसम्पन्नाः सर्वे ते स्थिरयौवनाः //
devalokacyutāstatra jāyante mānavāḥ śubhāḥ śuklābhijanasampannāḥ sarve te sthirayauvanāḥ //
Having fallen from the realm of the gods, they are born there as auspicious human beings—endowed with a pure and noble lineage; all of them possess steady, enduring youthfulness.
This verse does not describe pralaya; it teaches karmic return—after enjoying devaloka, beings descend and are reborn as fortunate humans with noble lineage and lasting youth.
It supports the Matsya Purana’s ethical logic that dharma and punya (charity, vows, righteous conduct) yield elevated states and, after heaven is exhausted, a high-quality human birth—encouraging householders and rulers to cultivate merit.
No direct vastu/temple rule appears here; the ritual takeaway is general—merit-producing practices can lead to heavenly attainment and then auspicious rebirth.