Matsya Purana — Pitṛ Worlds
अग्नीषोमयमानां तु कार्यमाप्यायनं बुधः अग्न्यभावे ऽपि विप्रस्य प्राणाव् अपि जले ऽथवा //
agnīṣomayamānāṃ tu kāryamāpyāyanaṃ budhaḥ agnyabhāve 'pi viprasya prāṇāv api jale 'thavā //
But for those engaged in the Agnīṣoma rite, the wise prescribe the act of ‘āpyāyana’ (ritual replenishment/strengthening). Even if fire is unavailable for a brāhmaṇa, it may be performed by using water—indeed, even by sustaining life through water as the substitute means.
This verse is not about pralaya; it focuses on ritual pragmatics—how a prescribed rite (Agnīṣoma-related ‘āpyāyana’) may be maintained even when the usual medium (fire) is unavailable.
It reflects dharma as practical continuity: a householder or patron of rites should ensure prescribed observances are not abandoned due to obstacles; authorized substitutes (like water when fire is absent) preserve ritual duty and social-religious order.
Ritually, it teaches the principle of substitution (pratinidhi) in Vedic practice—water can function as an alternative medium when fire-based performance is impossible, safeguarding the rite’s intended ‘strengthening/replenishment’ effect.