Matsya Purana — Śarkarā-Saptamī Vrata: The Sugar Offering Rite to Savitṛ
पञ्चगव्यं ततः पीत्वा स्वपेत्तत्पार्श्वतः क्षितौ सौरसूक्तं स्मरन्नास्ते पुराणश्रवणेन च //
pañcagavyaṃ tataḥ pītvā svapettatpārśvataḥ kṣitau saurasūktaṃ smarannāste purāṇaśravaṇena ca //
Then, having drunk the pañcagavya, one should sleep on the ground beside it, remaining mindful of the Saura hymn (Saura-sūkta) and also engaged in listening to Purāṇic recitation.
This verse is not about pralaya; it prescribes a purification observance—drinking pañcagavya, sleeping on the ground, and maintaining devotional remembrance—indicating how dharma is restored through ritual discipline rather than describing cosmic dissolution.
It presents a practical śuddhi/prāyaścitta regimen suitable to householders (and by extension rulers responsible for public dharma): bodily purification (pañcagavya), humility/continence (sleeping on the ground), and moral-spiritual cultivation (remembering a solar hymn and hearing Purāṇas).
The significance is ritual rather than architectural: pañcagavya functions as a standard purificatory substance, while Saura-sūkta remembrance and Purāṇa-śravaṇa frame the act as both cleansing and devotional, aligning bodily practice with mantra and sacred narration.