Matsya Purana — Saptamī Sacred Bath and the Mṛtavatsābhiṣeka Rite for Pacifying Misfortune an...
गोमयेनानुलिप्तायां भूमावेकाग्निवत्तदा तण्डुलै रक्तशालीयैश् चरुं गोक्षीरसंयुतम् निर्वपेत्सूर्यरुद्राभ्यां तन्मन्त्राभ्यां विधानतः //
gomayenānuliptāyāṃ bhūmāvekāgnivattadā taṇḍulai raktaśālīyaiś caruṃ gokṣīrasaṃyutam nirvapetsūryarudrābhyāṃ tanmantrābhyāṃ vidhānataḥ //
Then, on ground plastered with cow-dung, one should establish the sacred fire as for the one-fire rite. Using grains of red śāli-rice, he should prepare a caru (cooked oblation) mixed with cow’s milk, and offer it duly with the mantras of Sūrya and Rudra, according to the prescribed rule.
This verse is not about Pralaya; it prescribes a practical fire-offering (homa) method, emphasizing purity of the ritual ground and correct mantra-based oblations.
It reflects dharmic duty through regulated worship: maintaining sacred fire discipline, preparing prescribed offerings (caru), and performing deity-directed oblations with correct mantras—acts applicable to householders and also to kings sponsoring rites.
Ritually, it specifies altar/ground preparation (cow-dung plastering), a one-fire setup (ekāgni-style), and the precise offering substance (red śāli rice caru with cow’s milk) to be offered with Sūrya–Rudra mantras.