Matsya Purana — Manvantaras
सामान्येषु च धर्मेषु तथा वैशिषिकेषु च ब्रह्मक्षत्रविशो युक्ताः श्रौतस्मार्तेन कर्मणा //
sāmānyeṣu ca dharmeṣu tathā vaiśiṣikeṣu ca brahmakṣatraviśo yuktāḥ śrautasmārtena karmaṇā //
In duties that are common (to all) and in those that are specific (to each class) as well, the Brāhmaṇa, Kṣatriya, and Vaiśya are to be properly engaged in actions prescribed by Śruti and Smṛti.
This verse is not about Pralaya; it outlines dharma—how social classes should follow both universal duties and class-specific duties grounded in Śruti and Smṛti.
It frames governance and household life as Śrauta-Smārta regulated: a Kṣatriya king and other twice-born householders should uphold universal virtues while also performing their prescribed Vedic and Smṛti-based obligations.
The ritual takeaway is explicit: conduct should be “śrauta-smārta,” i.e., aligned with Vedic rites (Śrauta) and Smṛti-based domestic/ethical observances (Smārta), which also underpins later temple and ritual procedures in Purāṇic practice.