Matsya Purana — Saptamī Sacred Bath and the Mṛtavatsābhiṣeka Rite for Pacifying Misfortune an...
व्याहृतीभिस्तथाज्येन तथैवाष्टशतं पुनः हुत्वा स्नानं च कर्तव्यं मङ्गलं येन धीमता //
vyāhṛtībhistathājyena tathaivāṣṭaśataṃ punaḥ hutvā snānaṃ ca kartavyaṃ maṅgalaṃ yena dhīmatā //
Having again offered eight hundred oblations with the sacred utterances (vyāhṛtis) together with ghee, the wise person should then perform a bath—by which auspiciousness is secured.
This verse is not about Pralaya; it prescribes a purification-and-auspiciousness sequence (homa with vyāhṛtis and ghee, followed by bathing) typical of dharmic ritual discipline.
It reflects the householder/kingly duty to uphold ritual order: completing prescribed oblations and then performing snāna as a rite of purification, ensuring personal and public maṅgala (welfare and auspiciousness).
The significance is ritual: offering 800 āhuti-s with vyāhṛtis and ghee, then concluding with a purificatory bath—an orthodox completion pattern for śānti/maṅgala-oriented homa rites.