Matsya Purana — The Greatness and Procedure of the Aṅgāra
तथास्तमित आदित्ये गोमयेनानुलेपयेत् प्राङ्गणं पुष्पमालाभिर् अक्षताभिः समन्ततः //
tathāstamita āditye gomayenānulepayet prāṅgaṇaṃ puṣpamālābhir akṣatābhiḥ samantataḥ //
Then, when the sun has set, one should smear the courtyard with cow-dung and adorn it on all sides with garlands of flowers and with unbroken rice-grains (akṣata).
This verse does not address pralaya; it gives practical ritual guidance for preparing a purified, auspicious space (prāṅgaṇa) for sacred activity.
It reflects the householder/ritual patron’s duty to maintain śauca (purity) and maṅgala (auspicious order) before ceremonies—cleaning and sanctifying the venue with traditional purifiers (gomaya) and auspicious items (akṣata, flowers).
It describes ritual ground-preparation: plastering with cow-dung as a traditional purifier/coating and marking auspiciousness by circumferential decoration using flower garlands and akṣata—standard Vastu/ritual preliminaries before worship or consecratory rites.