Matsya Purana — Manvantaras
मनुः सप्तर्षयश्चैव लोकसंतानकारिणः तिष्ठन्तीह च धर्मार्थं ताञ्छिष्टान्सम्प्रचक्षते //
manuḥ saptarṣayaścaiva lokasaṃtānakāriṇaḥ tiṣṭhantīha ca dharmārthaṃ tāñchiṣṭānsampracakṣate //
Manu and the Seven Sages—who bring about the continuance of the world’s progeny—abide here for the sake of Dharma; therefore they are rightly proclaimed to be the Śiṣṭas, authoritative learned exemplars.
Rather than describing Pralaya directly, the verse emphasizes post-crisis continuity: Manu and the Saptarishis preserve the world’s lineage and re-establish Dharma, ensuring societal order across ages.
It grounds ethical practice in the model of the Śiṣṭas: kings and householders should follow the standards set by Manu and the Saptarishis—maintaining lineage, social stability, and righteous conduct as the practical expression of Dharma.
No direct Vāstu or iconography rule is stated; the takeaway is methodological: ritual and conduct should follow Śiṣṭa-approved tradition (sadācāra), i.e., practices validated by authoritative exemplars.