Matsya Purana — Inquiry into Yayāti’s Story and the Kacha–Devayānī Episode
*शुक्र उवाच संसिद्धरूपो ऽसि बृहस्पतेः सुत यत्त्वां भक्तं भजते देवयानी विद्यामिमां प्राप्नुहि जीवनीं त्वं न चेदिन्द्रः कचरूपी त्वमद्य //
*śukra uvāca saṃsiddharūpo 'si bṛhaspateḥ suta yattvāṃ bhaktaṃ bhajate devayānī vidyāmimāṃ prāpnuhi jīvanīṃ tvaṃ na cedindraḥ kacarūpī tvamadya //
Śukra said: “O son of Bṛhaspati, your purpose has been fully accomplished. Since Devayānī, devoted to you, seeks you with bhakti, receive from me this life-restoring knowledge—the Sañjīvanī. Otherwise, Indra himself is here today in the guise of Kaca.”
This verse does not address Pralaya; it focuses on the Sañjīvanī (life-restoring) mantra-knowledge within a moral-historical narrative.
It indirectly teaches discernment and integrity: even sacred knowledge can be entangled with deception (Indra’s intrigue), so a ruler/householder should test motives, protect trust, and act with dharmic clarity in alliances and learning.
No Vāstu or temple-architecture rule appears here; the ritual takeaway is the prominence of mantra-vidyā (Sañjīvanī) as a specialized, life-restoring sacred knowledge transmitted by a qualified teacher.