Matsya Purana — The Sarasvata Vrata: Vow for Sweet Speech
ब्रह्मलोके वसेद् राजन् यावत् कल्पायुतत्रयम् //
brahmaloke vased rājan yāvat kalpāyutatrayam //
O King, he dwells in Brahmā’s world (Brahmaloka) for as long as three ayutas of kalpas.
It uses cosmic time (kalpa) to measure merit’s duration, implying a Brahmā-centered cosmology where rewards can last across vast aeons, though it does not directly describe Pralaya itself.
By addressing “O King” and promising residence in Brahmaloka, it frames righteous conduct—especially royal dharma—as producing extraordinary long-lasting spiritual merit and posthumous reward.
No Vāstu, iconographic, or ritual procedure is specified here; the verse focuses on the cosmological reward (Brahmaloka) and its immense duration.