Matsya Purana — Characteristics of Dvāpara and Kali Yugas
वर्णाश्रमाचारयुतं श्रौतस्मार्तविधानतः एवं तेषु क्रियावत्सु प्रवर्तन्तीह वै कृते //
varṇāśramācārayutaṃ śrautasmārtavidhānataḥ evaṃ teṣu kriyāvatsu pravartantīha vai kṛte //
In the Kṛta Yuga, people here were established in the proper conduct of the varṇas and āśramas, acting in accordance with the ordinances of both Śruti (Vedic revelation and rites) and Smṛti (traditional law). Thus, among those devoted to prescribed duties, right practice prevailed.
This verse does not describe pralaya directly; it characterizes the Kṛta Yuga as an age where dharma is firmly upheld through varṇāśrama conduct and faithful Śrauta–Smārta observances.
It implies that governance and household life should support varṇāśrama order: kings protect and enable lawful practice, while householders and other āśramas perform duties according to Śruti-based rites and Smṛti-based ethical/legal norms.
The ritual significance is explicit: proper practice follows both Śrauta (Vedic sacrificial procedure) and Smārta (Smṛti-guided rites and conduct), indicating a complete ritual ecosystem rather than a specific Vāstu or temple rule.