Matsya Purana — Inquiry into Yayāti’s Story and the Kacha–Devayānī Episode
न निवर्तेत्पुनर्जीवन् कश्चिदन्यो ममोदरात् ब्राह्मणं वर्जयित्वैकं तस्माद्विद्याम् अवाप्नुहि //
na nivartetpunarjīvan kaścidanyo mamodarāt brāhmaṇaṃ varjayitvaikaṃ tasmādvidyām avāpnuhi //
No one else will return alive from within my belly—except for a single brāhmaṇa. Therefore, obtain (and preserve) the sacred knowledge.
It implies a Pralaya-like catastrophe where survival is rare, and emphasizes that continuity after the deluge depends on preserving sacred knowledge through a protected survivor.
It frames a ruler’s (and responsible person’s) duty as protecting dharma by safeguarding learning and transmitting it—especially in times of crisis—rather than focusing only on physical survival.
No direct Vāstu or temple-building rule appears in this verse; its ritual takeaway is the imperative to preserve and transmit vidyā (sacred learning), which underlies correct rites and tradition.