Matsya Purana — Catalogue of the Eighteen Puranas
अष्टादश पुराणानि कृत्वा सत्यवतीसुतः भारताख्यानमखिलं चक्रे तदुपबृंहितम् लक्षेणैकेन यत्प्रोक्तं वेदार्थपरिबृंहितम् //
aṣṭādaśa purāṇāni kṛtvā satyavatīsutaḥ bhāratākhyānamakhilaṃ cakre tadupabṛṃhitam lakṣeṇaikena yatproktaṃ vedārthaparibṛṃhitam //
After composing the eighteen Purāṇas, the son of Satyavatī (Vyāsa) also produced the entire narrative called the Bhārata, expanding it; it was taught in a single lakh (one hundred thousand verses) and is filled out with the meanings of the Veda.
This verse does not describe Pralaya directly; it emphasizes textual preservation of dharma and Vedic meaning through Vyāsa’s composition of the Purāṇas and the expanded Bhārata.
By presenting the Mahābhārata as “Veda-meaning made accessible,” it implies that kings and householders should learn dharma and right conduct from Itihāsa–Purāṇa when direct Vedic study is difficult.
No specific Vāstu or temple-ritual rule is stated; the significance is broader—Purāṇic literature functions as an authoritative guide that elsewhere includes ritual procedures and sacred regulations.