Matsya Purana — Genealogy from Budha to Purūravas and Yayāti; Raji’s war episode; the Paurava...
वेदत्रयीपरिभ्रष्टांश् चकार धिषणाधिपः वेदबाह्यान्परिज्ञाय हेतुवादसमन्वितान् //
vedatrayīparibhraṣṭāṃś cakāra dhiṣaṇādhipaḥ vedabāhyānparijñāya hetuvādasamanvitān //
The Lord of Intelligence (Bṛhaspati) fashioned them into those who had fallen away from the three Vedas; recognizing them as outside the Veda, he imbued them with the doctrine of mere reasoning (hetuvāda).
This verse does not discuss pralaya; it addresses doctrinal deviation—how beings become “outside the Veda” by adopting hetuvāda as the sole authority.
It implies that rulers and householders should uphold Veda-based dharma and be cautious of teachings that reject śruti, since such “Veda-bāhya” views are portrayed as leading communities away from orthodox duty and sacrificial-ethical order.
No Vāstu or temple rule is stated here; the ritual takeaway is indirect—ritual legitimacy is tied to the Trayī (Vedic authority), while hetuvāda-alone is treated as non-Vedic.