Matsya Purana — Prologue to the Matsya Purana and the Manu–Pralaya Rescue Narrative
बभूव वरदश् चास्य वर्षायुतशते गते वरं वृणीष्व प्रोवाच प्रीतः स कमलासनः //
babhūva varadaś cāsya varṣāyutaśate gate varaṃ vṛṇīṣva provāca prītaḥ sa kamalāsanaḥ //
And after a hundred thousand years had passed, the Lotus-seated One (Brahmā), pleased with him, became a giver of boons and said: “Choose a boon.”
It sets the prelude to the flood-cycle narrative by marking immense cosmic time and divine intervention—Brahmā’s boon becomes the narrative trigger for events leading toward the Pralaya account.
It highlights the Purāṇic ideal that sustained discipline (tapas) and righteous intent can legitimate authority and protection—qualities expected of a king like Manu and exemplary householders.
No direct Vāstu or temple-rule detail appears here; the ritual takeaway is the efficacy of long austerity and divine sanction (vara) as a foundation for later prescribed rites and dharmic action.