Matsya Purana — Account of the Manvantaras: Manus
दत्तो निश्च्यवनस्तम्बः प्राणः कश्यप एव च और्वो बृहस्पतिश्चैव सप्तैते ऋषयः स्मृताः //
datto niścyavanastambaḥ prāṇaḥ kaśyapa eva ca aurvo bṛhaspatiścaiva saptaite ṛṣayaḥ smṛtāḥ //
Datta, Niścyavana, Stambha, Prāṇa, and also Kaśyapa; likewise Aurva and Bṛhaspati—these seven are remembered as sages (ṛṣis).
This verse does not describe Pralaya directly; it preserves the rishi-paramparā (a canonical list of seven sages), a key framework used in Puranic cosmology to transmit knowledge across ages.
By naming authoritative sages, the verse points to the sources of dharma and sacred instruction; kings and householders are expected to align conduct, ritual, and governance with teachings preserved through such recognized ṛṣis.
No direct Vastu or temple-building rule is stated; its ritual significance is indirect—these sage lineages function as traditional authorities whose teachings underpin rites, mantras, and later technical disciplines (including Vastuvidyā) in Puranic culture.