Matsya Purana — Yayāti’s Fall
अप्राप्यं दीर्घमायुश्च यः प्राप्तो विकृतिं चरेत् तप्येत यदि तत्कृत्वा चरेत्सोग्रं तपस्ततः //
aprāpyaṃ dīrghamāyuśca yaḥ prāpto vikṛtiṃ caret tapyeta yadi tatkṛtvā caretsograṃ tapastataḥ //
If someone has obtained what is seldom attained—a long span of life—yet lives in a perverted way, then, having acted so, he should feel remorse and thereafter undertake severe austerity (tapas).
This verse is not about Pralaya; it is a moral instruction stressing that a rare human advantage—long life—should not be wasted in corrupt conduct, and that wrongdoing calls for remorse and corrective tapas.
For a king or householder, the teaching is practical: longevity and power are meaningful only when governed by dharma. If one falls into harmful habits or unjust actions, one should acknowledge the fault and adopt disciplined self-restraint and expiatory practices to restore righteousness.
No Vastu or temple-building rule is stated here; the ritual takeaway is the general principle of prāyaścitta-like correction—remorse followed by disciplined austerity to counter prior moral deviation.