Matsya Purana — Measures of Time: Caturyuga Computation
नोक्तं त्रेतायुगे शेषं तद्वक्ष्यामि निबोधत अथ त्रेतायुगस्यादौ मनुः सप्तर्षयश्च ये श्रौतस्मार्तं ब्रुवन्धर्मं ब्रह्मणा तु प्रचोदिताः //
noktaṃ tretāyuge śeṣaṃ tadvakṣyāmi nibodhata atha tretāyugasyādau manuḥ saptarṣayaśca ye śrautasmārtaṃ bruvandharmaṃ brahmaṇā tu pracoditāḥ //
What remains unsaid about the Tretā Yuga I shall now declare; listen attentively. At the beginning of the Tretā Yuga, Manu and the Seven Ṛṣis, urged on by Brahmā, proclaimed the dharma according to the Śrauta and Smārta traditions.
This verse is not about Pralaya; it shifts to yuga-dharma, stating that at the start of the Tretā Yuga, Manu and the Seven Ṛṣis—prompted by Brahmā—set forth the ritual and conduct-based dharma.
It grounds royal and household duty in two authoritative streams: Śrauta rites (public Vedic sacrifices and obligations) and Smārta norms (ethical conduct, domestic rituals, and dharmaśāstra-based practice), presented as promulgated by Manu and the Ṛṣis under Brahmā’s sanction.
The ritual significance is explicit: “Śrauta–Smārta dharma” indicates formal Vedic sacrificial procedure implied by Śrauta and the regulated domestic/ethical observances implied by Smārta; no specific Vāstu or temple-building rule is stated in this verse.