Matsya Purana — Inquiry into Taraka’s Slaying and the Prelude to Guha
चकार सप्तधा गर्भं कुलिशेन तु देवराट् एकैकं तु पुनः खण्डं चकार मघवा ततः //
cakāra saptadhā garbhaṃ kuliśena tu devarāṭ ekaikaṃ tu punaḥ khaṇḍaṃ cakāra maghavā tataḥ //
Then Indra, the king of the gods, with his thunderbolt (kuliśa), split the embryo into seven parts; thereafter Maghavan (Indra) again cut each part into separate pieces.
This verse is not about Pralaya; it narrates a mythic act by Indra using the vajra to divide an embryo, an etiological motif explaining the emergence of multiple beings rather than cosmic dissolution.
Indirectly, it reflects a Purāṇic theme that power (vajra/sovereignty) must be exercised with discernment; later ethical sections of the Matsya Purana contrast such violent mythic acts with the king’s dharmic duty to protect life and uphold order.
No Vastu or temple-architecture rule is stated here; the technical focus is mythic (vajra/kuliśa and division into parts), not ritual procedure or building canons.