Matsya Purana — The Greatness of Prayaga and the Supremacy of Cow-Donation
गवां शतसहस्रेभ्यो दद्यादेकां पयस्विनीम् पुत्रान्दारांस्तथा भृत्यान् गौरेका प्रति तारयेत् //
gavāṃ śatasahasrebhyo dadyādekāṃ payasvinīm putrāndārāṃstathā bhṛtyān gaurekā prati tārayet //
Even among hundreds of thousands of cows, one should give as a gift a single milk-yielding cow; by that one cow, a person is said to help ferry across to spiritual welfare his sons, wife, and even his dependents.
This verse does not discuss Pralaya; it focuses on dāna-dharma, specifically the salvific merit attributed to gifting a milk-yielding cow.
It presents a householder-oriented ethic of charity: even a single properly offered go-dāna is praised as generating merit that supports the welfare of one’s entire household—children, spouse, and dependents.
The ritual takeaway is go-dāna (donation of a lactating cow) as a high-merit charitable act; no Vāstu or temple-architecture instruction is stated in this verse.