Matsya Purana — Catalogue of the Eighteen Puranas
ब्रह्मा ब्रह्माण्डमाहात्म्यम् अधिकृत्याब्रवीत्पुनः तच्च द्वादशसाहस्रं ब्रह्माण्डं द्विशताधिकम् //
brahmā brahmāṇḍamāhātmyam adhikṛtyābravītpunaḥ tacca dvādaśasāhasraṃ brahmāṇḍaṃ dviśatādhikam //
Brahmā, taking up again the topic of the glory of the Brahmāṇḍa (the cosmic egg), spoke further: “That Brahmāṇḍa is twelve thousand, with two hundred more added.”
It focuses on cosmological description rather than Pralaya directly—highlighting the Brahmāṇḍa’s stated measure (12,200), a typical Purāṇic way of expressing the universe’s scale and structure.
Indirectly: the Matsya Purana often frames dharma within a cosmic order. By presenting the universe as measurable and ordered, it supports the idea that kingship and household life should mirror order, proportion, and rule-governed conduct.
No direct Vāstu or ritual rule is stated, but the emphasis on proportion and sacred numeration aligns with Purāṇic/Vāstu thinking where correct measurement and cosmic correspondences guide temple plans and ritual layouts.