Matsya Purana — Characteristics of Dvāpara and Kali Yugas
स हत्वा सर्वशश्चैव राजानः शूद्रयोनयः पाषण्डान्स सदा सर्वान् निःशेषानकरोत्प्रभुः //
sa hatvā sarvaśaścaiva rājānaḥ śūdrayonayaḥ pāṣaṇḍānsa sadā sarvān niḥśeṣānakarotprabhuḥ //
Having slain, in every way, the kings born of Śūdra lineage, that mighty lord also always exterminated all the pāṣaṇḍas (heretical, anti-Vedic sectarians) without remainder.
This verse does not discuss pralaya; it focuses on rajadharma—how a ruler uses force to remove threats to dharma and social order.
It presents an extreme rajadharma stance: the king, as wielder of daṇḍa (punitive power), is portrayed as eliminating rival kings and pāṣaṇḍas seen as destabilizing dharma; the broader ethical frame is protection of order through enforcement.
No vastu/temple-building or ritual procedure is mentioned; the content is political-ethical (governance and suppression of adharma).