Matsya Purana — The Greatness of Prayaga and the Supremacy of Cow-Donation
कर्मणा मनसा वाचा धर्मसत्यप्रतिष्ठितः गङ्गायमुनयोर्मध्ये यस्तु गां सम्प्रयच्छति //
karmaṇā manasā vācā dharmasatyapratiṣṭhitaḥ gaṅgāyamunayormadhye yastu gāṃ samprayacchati //
Established in dharma and truth through deed, thought, and speech, whoever bestows a cow in the land between the Gaṅgā and the Yamunā attains great religious merit.
This verse is not about pralaya; it teaches dharma through charitable giving (especially go-dana) and emphasizes inner and outer purity—deed, thought, and speech.
It frames charity as a core duty: a householder (and by extension a king as protector of dharma) should give with integrity—truthful intent, righteous conduct, and proper speech—especially in renowned sacred regions.
The ritual point is go-dana (gift of a cow) performed in a highly sanctified tirtha-region (between the Ganga and Yamuna), highlighting place-based merit rather than any Vastu or temple-building rule.