Matsya Purana — Manvantaras
धर्मज्ञैर्विहितो धर्मः श्रौतस्मार्तो द्विजातिभिः दाराग्निहोत्रसम्बन्धम् इज्या श्रौतस्य लक्षणम् //
dharmajñairvihito dharmaḥ śrautasmārto dvijātibhiḥ dārāgnihotrasambandham ijyā śrautasya lakṣaṇam //
The dharma prescribed by those who know dharma—taught for the twice-born—is of two kinds: Śrauta and Smārta. Worship (ijyā) that is bound up with one’s wife and the maintaining of the sacred fires (agnihotra) is the defining mark of Śrauta practice.
This verse does not address pralaya; it defines categories of dharma (Śrauta and Smārta) and identifies Śrauta worship by its link to the householder’s sacred fires and marital household order.
It frames orthodox practice for dvijas: for householders, maintaining the agnihotra fires and performing Vedic rites with the wife as ritual partner is presented as a hallmark of Śrauta duty—an ethical-religious standard that rulers also uphold by supporting and protecting such rites.
The ritual takeaway is central: Śrauta worship is characterized by agnihotra-based fire-rituals performed within the gṛhastha framework (including the wife’s participation), distinguishing it from Smārta observances grounded more in smṛti tradition and domestic rites.