Matsya Purana — The Episode of Madhu and Kaiṭabha: Gunas
सुखं यत्र मुदा युक्तं यत्र श्रीः कीर्तिरेव च येषां यत्काङ्क्षितं चैव तत्तदावां विचिन्तय //
sukhaṃ yatra mudā yuktaṃ yatra śrīḥ kīrtireva ca yeṣāṃ yatkāṅkṣitaṃ caiva tattadāvāṃ vicintaya //
Consider well—where happiness is joined with gladness, where prosperity and fame are found, and for whom the desired aim is actually fulfilled—reflect on that, for us both.
This verse does not speak directly about Pralaya; it functions as ethical counsel, emphasizing discernment about what leads to happiness, prosperity (śrī), and fame (kīrti).
It urges thoughtful deliberation (vicintaya) about which choices genuinely yield well-being—material prosperity, good reputation, and the attainment of rightful aims—central concerns in Rajadharma and gṛhastha conduct.
No explicit Vāstu or ritual procedure is stated; the takeaway is a general principle of selecting actions and policies that produce auspicious results (śrī) and public esteem (kīrti), which can indirectly guide patronage of rites and building works.