Matsya Purana — Prologue to the Matsya Purana and the Manu–Pralaya Rescue Narrative
कदाचिदाश्रमे तस्य कुर्वतः पितृतर्पणम् पपात पाण्योर् उपरि शफरी जलसंयुता //
kadācidāśrame tasya kurvataḥ pitṛtarpaṇam papāta pāṇyor upari śapharī jalasaṃyutā //
Once, while he was in his hermitage performing the libation-offering to the ancestors (pitṛ-tarpaṇa), a small fish, still wet with water, fell upon the palms of his hands.
It sets the narrative trigger for the Pralaya account: the divine fish appears to Manu during a rite, initiating the chain of events that leads to the Great Flood warning and preservation theme.
Manu is shown performing pitṛ-tarpaṇa, highlighting the Dharma duty of honoring ancestors—an essential householder/kingly obligation even for rulers and lawgivers.
The ritual element is explicit: pitṛ-tarpaṇa (ancestral libations) performed in an āśrama setting, emphasizing correct domestic/āśrama-based rites rather than temple architecture in this verse.