Matsya Purana — Ritual Bathing
अपसव्यं ततः कृत्वा सव्यं जान्वाच्य भूतले अग्निष्वात्तास्तथा सौम्या हविष्मन्तस्तथोष्मपाः //
apasavyaṃ tataḥ kṛtvā savyaṃ jānvācya bhūtale agniṣvāttāstathā saumyā haviṣmantastathoṣmapāḥ //
Then, having arranged the rite in the apasavya manner, he should place his left knee upon the ground and invoke the Pitṛs—namely the Agniṣvāttas, the Saumyās, the Haviṣmants, and the Oṣmapās.
This verse is not about pralaya; it gives a Śrāddha ritual detail—using apasavya orientation and invoking specific classes of Pitṛs—showing how dharma is maintained through ancestral rites rather than describing cosmic dissolution.
It supports the householder’s (and by extension a king’s) dharma of pitṛ-tarpaṇa and śrāddha: honoring ancestors through correctly performed rites, including the apasavya mode and formal invocation of Pitṛ groups.
The significance is ritual: apasavya (thread/gesture orientation for Pitṛ rites), kneeling with the left knee to the ground, and the precise naming of Pitṛ classes to be invoked—key procedural markers for Śrāddha performance.