Matsya Purana — Yayāti and His Sons: The Exchange of Youth and Old Age
*ययातिरुवाच यस्त्वं मे हृदयाज्जातो वयः स्वं न प्रयच्छसि तद्द्रुह्यो वै प्रियः कामो न ते सम्पत्स्यते क्वचित् //
*yayātiruvāca yastvaṃ me hṛdayājjāto vayaḥ svaṃ na prayacchasi taddruhyo vai priyaḥ kāmo na te sampatsyate kvacit //
Yayāti said: “You who were born from my very heart—if you do not grant me your own youth—then, O Druhyu, the desire you hold dear shall never succeed for you, anywhere.”
This verse does not address Pralaya; it belongs to a dynastic-ethical episode where Yayāti warns his son about the consequences of refusing a request tied to youth and succession.
It reflects a Puranic ethical tension between personal desire and familial obligation: a king/father asserts authority and frames refusal as disloyalty, warning that self-centered desire (kāma) will fail without dharmic cooperation and respect within the family order.
No Vastu, temple-architecture, or ritual procedure is mentioned; the verse is focused on lineage, obedience, and the moral consequences of desire.