Matsya Purana — Glory of Prayaga: The Fruit of the Anashaka Fast and the Merit of the Yamuna
धर्मानुसारि तत्त्वज्ञ पृच्छतस्ते पुनः पुनः त्वत्प्रियार्थं समाख्यातं गुह्यमेतत्सनातनम् //
dharmānusāri tattvajña pṛcchataste punaḥ punaḥ tvatpriyārthaṃ samākhyātaṃ guhyametatsanātanam //
O follower of Dharma, O knower of truth—since you have asked again and again, for your own benefit I have explained this eternal, confidential teaching.
This verse does not describe Pralaya directly; it frames the teaching as “eternal” and “confidential,” indicating a timeless doctrine that remains relevant across cycles of creation and dissolution.
By praising Manu as a dharma-follower and truth-knower, the verse implies that rulers and householders should repeatedly inquire into dharma and receive instruction for their own welfare and right governance.
No specific Vastu or ritual procedure is stated in this verse; it functions as a preface emphasizing that what follows is a guarded, authoritative instruction—often the manner in which ritual or technical rules are introduced in the Purana.