Matsya Purana — Vrata-Ṣaṣṭhī: The Sixty Sacred Vows
त्रिरात्रोपोषितो दद्यात् फाल्गुन्यां भवनं शुभम् आदित्यलोकमाप्नोति धामव्रतमिदं स्मृतम् //
trirātropoṣito dadyāt phālgunyāṃ bhavanaṃ śubham ādityalokamāpnoti dhāmavratamidaṃ smṛtam //
Having fasted for three nights, one should, in the month of Phālguna, gift a fine and auspicious house; by this observance one attains the world of Āditya (the Sun). This is known as the Dhāma-vrata.
This verse does not discuss pralaya; it teaches a merit-producing vow (dhāma-vrata) centered on fasting and charitable gifting, promising attainment of Āditya’s realm.
It frames an ideal householder’s (and ruler’s) dharma as disciplined self-restraint (three-night fast) followed by high-value charity (gifting a dwelling), portraying social welfare and dāna as spiritually elevating.
Ritually, it prescribes trirātra-upoṣa (three-night fasting) and specifies timing (Phālguna). Architecturally, it highlights bhavana-dāna—donating a proper dwelling—as a meritorious act, implying the religious value of well-made, auspicious housing.