Matsya Purana — Purūravas Witnesses the Sports of Apsarases and Gandharvas; Attains the Grace...
फाल्गुनामलपक्षान्ते राजा स्वप्ने पुरूरवाः तस्यैव देवदेवस्य श्रुतवान्गदितं शुभम् //
phālgunāmalapakṣānte rājā svapne purūravāḥ tasyaiva devadevasya śrutavāngaditaṃ śubham //
At the close of the bright fortnight of Phālguna, King Purūravas, in a dream, heard the auspicious words spoken by that very God of gods.
This verse does not describe pralaya directly; it highlights divine communication (a dream-oracle) and auspicious calendrical timing, typical of Purāṇic narrative technique rather than cosmological dissolution.
It portrays a king receiving guidance from the divine, implying that righteous rulership (rājadharma) includes attentiveness to sacred instruction and acting in harmony with auspicious time and dharmic counsel.
No explicit Vāstu or temple rule is stated; the ritual takeaway is the emphasis on auspicious timing—“the end of the bright fortnight of Phālguna”—often used in Purāṇas to mark suitable moments for vows, worship, or significant actions.