Matsya Purana — Catalogue of the Eighteen Puranas
लिखित्वा तच्च यो दद्याद् धेमसिंहसमन्वितम् पौर्णमास्यां प्रौष्ठपद्यां स याति परमां गतिम् अष्टादश सहस्राणि पुराणं तत्प्रचक्षते //
likhitvā tacca yo dadyād dhemasiṃhasamanvitam paurṇamāsyāṃ prauṣṭhapadyāṃ sa yāti paramāṃ gatim aṣṭādaśa sahasrāṇi purāṇaṃ tatpracakṣate //
Whoever has that Purāṇa written out and then donates it, adorned with a golden lion-throne, on the full-moon day of the month of Prauṣṭhapada, attains the highest state. This Purāṇa is declared to consist of eighteen thousand verses.
This verse does not describe Pralaya; it is a phalaśruti focused on the merit (puṇya) of writing and donating the Purāṇa, promising the “supreme state” as the fruit.
It frames a dharmic household/royal duty: supporting transmission of sacred knowledge by commissioning a manuscript and donating it ceremonially (especially on an auspicious full-moon day), a classic Purāṇic model of dāna (pious giving).
Ritually, the donation is timed to Prauṣṭhapada Pūrṇimā and includes presenting the text with a “golden lion-seat” (siṃhāsana), signaling honor and proper installation/display of the scripture during dāna.