Matsya Purana — Manvantaras
ऋषिजो बृहच्छुक्लश्च ऋषिर्दीर्घतमा अपि कक्षीवांश्च त्रयस्त्रिंशत् स्मृता ह्यङ्गिरसां वराः //
ṛṣijo bṛhacchuklaśca ṛṣirdīrghatamā api kakṣīvāṃśca trayastriṃśat smṛtā hyaṅgirasāṃ varāḥ //
Ṛṣija, Bṛhacchukla, the sage Dīrghatamas, and Kakṣīvān—these are remembered as thirty-three eminent seers of the lineage of Aṅgiras.
This verse does not describe Pralaya; it preserves lineage-memory by listing eminent Aṅgirasa seers, reflecting the Purāṇic aim of safeguarding sacred transmission across ages.
By naming authoritative ṛṣis, the verse supports dharma-practice: kings and householders are to honor Vedic lineages, consult qualified Brahmin sages, and uphold rites grounded in recognized pravara and guru-paramparā.
No Vāstu rule is stated directly, but such rishi lists are ritually significant for pravara-recitation and lineage validation in sacrifices—foundational for correct performance of śrauta/smārta rites referenced throughout the Matsya Purana.