Matsya Purana — Manvantaras
इत्येते सप्त विज्ञेया वासिष्ठा ब्रह्मवादिनः विश्वामित्रश्च गाधेयो देवरातस्तथा बलः //
ityete sapta vijñeyā vāsiṣṭhā brahmavādinaḥ viśvāmitraśca gādheyo devarātastathā balaḥ //
Thus, these seven are to be known as the Vāsiṣṭha brahma-vādins (expounders of sacred knowledge); and also Viśvāmitra, the son of Gādhi, along with Devarāta and Bala.
This verse does not address Pralaya; it catalogs revered brahmavādins and associated sages, serving the Matsya Purana’s genealogical and tradition-preserving purpose.
By naming authoritative brahmavādins and rishi lineages, the text indicates whom kings and householders should honor, consult, and support—upholding dharma through respect for Vedic teachers and inherited sacred traditions.
No explicit Vāstu or temple-architecture rule appears here; the ritual takeaway is indirect—recognition of brahmavādins underscores the legitimacy of rites when transmitted through established rishi lineages.