Matsya Purana — Vrata-Ṣaṣṭhī: The Sixty Sacred Vows
त्रिसंध्यं पूज्य दाम्पत्यम् उपवासी विभूषणैः अन्नं गाश्च समाप्नोति मोक्षमिन्द्रव्रतादिह //
trisaṃdhyaṃ pūjya dāmpatyam upavāsī vibhūṣaṇaiḥ annaṃ gāśca samāpnoti mokṣamindravratādiha //
By worshipping at the three sandhyās (dawn, noon, and dusk), honoring the conjugal state, and observing fasts with proper adornment and ritual propriety, one obtains food and cows—and, through the Indra-vrata here, ultimately attains liberation (mokṣa).
This verse does not discuss pralaya directly; it teaches vrata-dharma—how disciplined daily worship, fasting, and righteous household life yield both worldly prosperity (food, cows) and the higher goal of mokṣa.
It highlights gṛhastha-dharma: regular tri-sandhyā worship and honoring the marital order (dāmpatya) as a sacred discipline. The promise of sustenance and cattle reflects stable household and societal prosperity, while the vow’s culmination is liberation.
The ritual significance is tri-sandhyā pūjā and observance of Indra-vrata with proper decorum (vibhūṣaṇaiḥ), implying orderly, rule-bound worship—timed daily rites, fasting discipline, and respectful presentation in ritual practice.