Matsya Purana — Vrata-Ṣaṣṭhī: The Sixty Sacred Vows
त्र्यहं पयोव्रते स्थित्वा काञ्चनं कल्पपादपम् पलादूर्ध्वं यथाशक्त्या तण्डुलैस् तूपसंयुतम् दत्त्वा ब्रह्मपदं याति कल्पव्रतमिदं स्मृतम् //
tryahaṃ payovrate sthitvā kāñcanaṃ kalpapādapam palādūrdhvaṃ yathāśaktyā taṇḍulais tūpasaṃyutam dattvā brahmapadaṃ yāti kalpavratamidaṃ smṛtam //
Having observed a milk-only vow for three days, one should, according to one’s capacity, offer a golden wish-fulfilling tree (kalpa-tree) filled—above the measure of one pala—with rice-grains mixed with ghee. By giving this, one attains the state/abode of Brahmā; this is remembered as the Kalpa-vrata.
This verse does not discuss Pralaya directly; it teaches a dharmic vow (payovrata) and a symbolic dāna (kalpa-tree offering) aimed at attaining Brahma-loka.
It frames a practical householder/royal duty: disciplined fasting (milk-only for three days) followed by charitable giving according to capacity—presenting dāna as a legitimate path to higher worlds and religious merit.
The ritual centers on crafting/arranging a ‘golden kalpa-tree’ (a symbolic wish-fulfilling tree) and filling it with rice mixed with ghee measured from a pala upward—indicating a precise dāna-vidhi (procedure and measurement) rather than temple architecture.