Matsya Purana — Catalogue of the Eighteen Puranas
तद् अष्टादशकं चैकं सहस्राणीह पठ्यते सौवर्णहंससंयुक्तं यो ददाति पुमानिह स सिद्धिं लभते मुख्यां शिवलोके च संस्थितिम् //
tad aṣṭādaśakaṃ caikaṃ sahasrāṇīha paṭhyate sauvarṇahaṃsasaṃyuktaṃ yo dadāti pumāniha sa siddhiṃ labhate mukhyāṃ śivaloke ca saṃsthitim //
Here it is recited as a single set of eighteen thousand. Whoever in this world donates it together with a golden haṃsa (swan) attains the highest siddhi and an abiding station in Śiva’s realm.
This verse does not discuss Pralaya directly; it focuses on dāna (charitable gifting) and the fruit of donating a revered textual corpus accompanied by a golden haṃsa, resulting in attainment of Śiva’s realm.
It frames a householder/kingly duty as supporting dharma through sanctioned gifts—specifically donating sacred recitations/texts and ritual emblems—promising high spiritual merit (siddhi) and an auspicious posthumous destination.
The ritual significance lies in the prescribed dāna: giving the recited corpus “together with a golden haṃsa,” a symbolic auspicious offering often linked with purity, discernment, and elevated spiritual states, used here as a merit-amplifying accompaniment to the gift.