Matsya Purana — Dynastic Genealogies: Paurava–Anu Lines
प्रसादिते गते तस्मिन् गोधर्मं भक्तितस्तु सः मनसैव समादध्यौ तन्निष्ठस्तत्परो हि सः //
prasādite gate tasmin godharmaṃ bhaktitastu saḥ manasaiva samādadhyau tanniṣṭhastatparo hi saḥ //
When that one had been graciously satisfied and had departed, he—out of devotion—mentally embraced the dharma taught there, remaining firmly established in it and wholly devoted to it.
This verse does not describe pralaya directly; it highlights the post-instruction response—internalizing dharma with devotion—rather than cosmology or dissolution.
It emphasizes that true duty is not merely external performance: a king or householder should adopt dharma inwardly (manasā), remain steadfast (tanniṣṭha), and prioritize it as the guiding aim (tatpara).
No specific vastu/temple rule is stated; the ritual takeaway is the principle of sincere inner assimilation of teachings—devotion and steadiness—after a rite, discourse, or instruction concludes.