Matsya Purana — The Rite and Glory of Meru-Dāna: The Tenfold ‘Gift of Meru’ and Mountain-Offe...
शुक्लपक्षे तृतीयायाम् उपरागे शशिक्षये विवाहोत्सवयज्ञेषु द्वादश्यामथ वा पुनः //
śuklapakṣe tṛtīyāyām uparāge śaśikṣaye vivāhotsavayajñeṣu dvādaśyāmatha vā punaḥ //
In the bright fortnight, on the third lunar day, and again at the time of an eclipse—when the Moon is waning—these times are prescribed for marriage-rites, festive celebrations, and sacrificial ceremonies; likewise, the twelfth lunar day too is again recommended.
It does not discuss pralaya directly; it focuses on dharma-oriented calendrical guidance—selecting tithis and special celestial conditions (like eclipses) for rites.
It supports the householder’s duty to perform saṃskāras and yajñas at properly sanctioned times; for a king, it reinforces maintaining public dharma by aligning state rituals and social ceremonies with authoritative calendrical prescriptions.
The ritual takeaway is muhūrta-selection: Shukla Paksha Tritiya and Dvadashi are highlighted as suitable tithis for vivāha, utsava, and yajña, with eclipse/waning-moon conditions also treated as ritually significant time-markers.