Matsya Purana — Śukra Warns Vṛṣaparvan: The Ripening of Adharma and Devayānī’s Demand for Śar...
फलत्येवं ध्रुवं पापं गुरुभुक्तमिवोदरे यदा घातयसे विप्रं कचमाङ्गिरसं तदा //
phalatyevaṃ dhruvaṃ pāpaṃ gurubhuktamivodare yadā ghātayase vipraṃ kacamāṅgirasaṃ tadā //
Thus sin surely ripens—like a heavy meal digested in the belly—at the very moment you strike down the Brahmin Kaca, the descendant of Aṅgiras.
This verse is not about Pralaya; it teaches karmic inevitability—grave sin “ripens” with certainty, emphasizing moral causality rather than cosmic dissolution.
It warns that violence against a Brahmin (vipra), especially murder, is a severe breach of dharma; for rulers and householders alike, protecting the righteous and restraining harm is presented as essential to avoid swift karmic downfall.
No Vāstu or temple-architecture rule is stated here; the ritual takeaway is ethical—brahmahatyā is portrayed as a sin with unavoidable, immediate fruition, underscoring the need for purity of conduct in all rites and social duties.