Matsya Purana — Hiranyakashipu’s Boons
अवश्यं त्रिदशास्तेन प्राप्तव्यं तपसः फलम् तपसो ऽन्ते ऽस्य भगवान् वधं विष्णुः करिष्यति //
avaśyaṃ tridaśāstena prāptavyaṃ tapasaḥ phalam tapaso 'nte 'sya bhagavān vadhaṃ viṣṇuḥ kariṣyati //
Surely, for this chastiser of the gods, the fruit of his austerities must be attained; yet, at the end of that austerity, the Blessed Lord Vishnu will bring about his death.
It does not describe Pralaya directly; it emphasizes cosmic regulation: even when a powerful being gains results from tapas, Vishnu ultimately re-establishes balance by ending the threat.
It underscores ethical restraint: power gained through discipline (tapas) must not become oppression; rulers and householders should pursue merit while remaining accountable to dharma, since adharma invites corrective justice.
No explicit Vastu or temple-ritual rule appears; the ritual takeaway is conceptual—tapas yields results, but its fruits must align with dharma, or divine correction follows.