Matsya Purana — The Greatness of Prayaga and Allied Tirthas
यजन्ते क्रतुभिर् देवास् तथा चक्रधरा नृपाः ततः पुण्यतमं नास्ति त्रिषु लोकेषु भारत //
yajante kratubhir devās tathā cakradharā nṛpāḥ tataḥ puṇyatamaṃ nāsti triṣu lokeṣu bhārata //
The gods worship through Vedic sacrifices (kratus), and likewise do the wheel-bearing kings. O Bhārata, in the three worlds there is nothing more supremely meritorious than that.
This verse does not discuss Pralaya directly; it emphasizes dharmic action—especially sacrifice—as a source of supreme merit across the three worlds.
It presents the king as an upholder of cosmic order through sanctioned Vedic rites (kratus), implying that righteous governance includes supporting and performing public sacrificial duties for social and spiritual welfare.
The ritual significance is primary: it elevates kratu-yajñas as the highest merit-producing acts; no specific Vāstu or temple-building rule is stated in this verse.