Matsya Purana — Solar Dynasty Prelude: Vivasvān–Saṃjñā–Chāyā
मौर्ख्यात्कस्य न दुःखं स्याद् अथवा कर्मसंततिः अनिवार्या भवस्यापि का कथान्येषु जन्तुषु //
maurkhyātkasya na duḥkhaṃ syād athavā karmasaṃtatiḥ anivāryā bhavasyāpi kā kathānyeṣu jantuṣu //
From folly, who would not fall into sorrow? Moreover, the continuing chain of karma is unavoidable—even for Śiva; what then can be said of other living beings?
It does not describe Pralaya directly; it teaches a broader metaphysical law: the continuity of karma is inescapable for embodied beings, which underlies why cycles of experience (including cosmic cycles) remain morally ordered.
It frames governance and household life as requiring vigilance against moha/ignorance: foolish decisions generate duḥkha, and since karmic consequences are unavoidable, a king or householder should act with dharma, foresight, and self-restraint.
No Vāstu or ritual procedure is specified here; the takeaway is ethical: correct knowledge and disciplined action are prerequisites for any successful rite or sacred construction because karma’s results cannot be bypassed.