Matsya Purana — Solar Dynasty Prelude: Vivasvān–Saṃjñā–Chāyā
मनोर् वैवस्वतस्यासन् दश पुत्रा महाबलाः इलस् तु प्रथमस्तेषां पुत्रेष्ट्यां समजायत //
manor vaivasvatasyāsan daśa putrā mahābalāḥ ilas tu prathamasteṣāṃ putreṣṭyāṃ samajāyata //
Vaivasvata Manu had ten mighty sons; among them, Ila was the first, born through the Putreṣṭi sacrifice, the rite performed to obtain offspring.
This verse does not describe Pralaya directly; it shifts to post-deluge human continuity by outlining Vaivasvata Manu’s progeny and the dynastic transmission of humanity.
By highlighting Putreṣṭi, it reflects the gṛhastha ideal of sustaining lineage through sanctioned Vedic rites—an ethical framework that also underpins royal succession and social stability in Purāṇic polity.
The ritual element is central: Putreṣṭi is a specialized yajña performed to obtain offspring, showing how Purāṇic genealogy is grounded in Vedic sacrificial procedure rather than architectural (Vāstu) instruction.