Matsya Purana — Rite and Layout for Consecrating Ponds
ततः सहस्रं विप्राणाम् अथवाष्टशतं तथा भोजनीयं यथाशक्ति पञ्चाशद्वाथ विंशतिः एवमेष पुराणेषु तडागविधिरुच्यते //
tataḥ sahasraṃ viprāṇām athavāṣṭaśataṃ tathā bhojanīyaṃ yathāśakti pañcāśadvātha viṃśatiḥ evameṣa purāṇeṣu taḍāgavidhirucyate //
Thereafter, one should feed a thousand Brahmanas—or else eight hundred—according to one’s capacity; or (if not possible) fifty, or even twenty. Thus is this procedure concerning a tank (taḍāga-vidhi) stated in the Purāṇas.
This verse does not address Pralaya; it focuses on dharmic merit connected with public water-works (building a tank) and the accompanying charitable feeding of Brahmanas.
It frames tank-building and charity as practical dharma: a ruler or householder should support public welfare (water resources) and perform vipra-bhojana, scaled to one’s means (yathāśakti), without abandoning the rite due to limited resources.
Ritually, it prescribes the concluding charitable act for taḍāga-vidhi—feeding Brahmanas in graded numbers (1000/800/50/20), emphasizing that the merit-bearing observance can be completed at different economic capacities.