Matsya Purana — The Tale of Brahmadatta: Past-life Memory
आराधयामास विभुं तीव्रव्रतपरायणः ततः कालेन महता तुष्टस्तस्य जनार्दनः //
ārādhayāmāsa vibhuṃ tīvravrataparāyaṇaḥ tataḥ kālena mahatā tuṣṭastasya janārdanaḥ //
Steadfast in austere vows, he worshipped the all-powerful Lord; and after a long passage of time, Janārdana became pleased with him.
This verse does not describe pralaya directly; it emphasizes the devotional law that sustained austerity and worship over time lead to the Lord’s satisfaction and grace.
It supports the Matsya Purana’s ethic that disciplined observances (vrata), self-restraint, and steady worship are duties that strengthen dharma—relevant to householders for daily conduct and to kings for personal discipline and righteous rule.
No specific Vāstu or temple-architecture rule is stated; the ritual takeaway is the efficacy of sustained vrata-based worship (ārādhana) culminating in divine approval (tuṣṭi).