Matsya Purana — Conclusion of the Prayaga Mahatmya: Kingship Restored
वासुदेवो ऽपि तत्रैव क्षणेनाभ्यागतस्तदा पाण्डवैः सहितैः सर्वैः पूज्यमानस्तु माधवः //
vāsudevo 'pi tatraiva kṣaṇenābhyāgatastadā pāṇḍavaiḥ sahitaiḥ sarvaiḥ pūjyamānastu mādhavaḥ //
Then Vāsudeva (Mādhava) too arrived at that very place in an instant, and all the Pāṇḍavas together duly honored and worshipped him.
This verse does not address pralaya or cosmology; it focuses on a devotional-historical moment where Krishna arrives and is honored by the Pandavas.
It highlights dharmic conduct—welcoming and honoring a revered guest (especially a divine or saintly person). Such respectful reception is a key virtue for rulers and householders in Puranic ethics.
No Vastu or temple-construction rule is stated directly; the ritual takeaway is the act of pūjā (formal honoring/worship) offered to a worthy recipient, reflecting proper ritual etiquette.