Matsya Purana — Vrata-Ṣaṣṭhī: The Sixty Sacred Vows
द्वादश द्वादशीर्यस्तु समाप्योपोषणेन च गोवस्त्रकाञ्चनैर्विप्रान् पूजयेच्छक्तितो नरः परमं पदं प्राप्नोति विष्णुव्रतमिदं स्मृतम् //
dvādaśa dvādaśīryastu samāpyopoṣaṇena ca govastrakāñcanairviprān pūjayecchaktito naraḥ paramaṃ padaṃ prāpnoti viṣṇuvratamidaṃ smṛtam //
Whoever completes twelve Dvādaśī observances, concludes them with fasting, and—according to one’s capacity—honors brāhmaṇas with gifts of cows, garments, and gold, attains the supreme abode. This is remembered as a Viṣṇu-vrata.
This verse does not address pralaya; it focuses on vrata-dharma—Dvādaśī fasting and charitable honoring of brāhmaṇas as a means to attain Viṣṇu’s supreme abode.
It presents a householder-accessible discipline: completing repeated Dvādaśī observances, concluding with upavāsa (fasting), and giving dāna (cows, clothing, gold) to worthy brāhmaṇas according to one’s means—linking personal devotion with social-religious duty.
The ritual significance is the Viṣṇu-vrata structure: a cycle of twelve Dvādaśīs, a concluding fast, and capacity-based gifts to brāhmaṇas—highlighting standard Purāṇic components of vrata (niyama + upavāsa + dāna).