Matsya Purana — The Procedure and Merit of the Śubha-Saptamī Vrata
पञ्चगव्यं च संप्राश्य स्वपेद्भूमौ विमत्सरः ततः प्रभाते संजाते भक्त्या सम्पूजयेद्द्विजान् //
pañcagavyaṃ ca saṃprāśya svapedbhūmau vimatsaraḥ tataḥ prabhāte saṃjāte bhaktyā sampūjayeddvijān //
After duly partaking of pañcagavya (the five cow-products used for purification), one should sleep on the ground, free from envy; then, when morning has arisen, one should devotedly honor and worship the twice-born (brāhmaṇas).
This verse does not address pralaya; it focuses on personal purification and disciplined conduct as part of a ritual observance.
It outlines a dharmic routine—ritual purification (pañcagavya), austerity (sleeping on the ground), and social-religious duty (reverently honoring brāhmaṇas)—applicable to householders and rulers who perform vows and sponsor rites.
The significance is ritual: pañcagavya is a standard purificatory substance, and honoring dvijas at dawn is part of vrata etiquette and merit-making, emphasizing purity, humility, and proper religious patronage.