Matsya Purana — War of Devas and Asuras; Birth of Aurva Fire; Countering Tamasī Māyā through ...
अब्भक्षा वायुभक्षाश्च दन्तोलूखलिनस्तथा अश्मकुट्टा ह्यशनकाः पञ्चातपसहाश्च ये //
abbhakṣā vāyubhakṣāśca dantolūkhalinastathā aśmakuṭṭā hyaśanakāḥ pañcātapasahāśca ye //
Those who subsist only on water, those who subsist only on air, those who pound (their food) with their teeth as with a mortar, those who crush (grains) with stone, those who remain without eating, and those who endure the ‘five fires’—all such ascetics are (here) being described.
This verse does not discuss pralaya; it catalogues types of tapas (extreme ascetic practices) recognized in the Matsya Purana’s dharma-oriented teaching.
By listing graded austerities, it frames self-restraint as a dharmic ideal; a householder or king is generally advised to honor such ascetics and adopt moderated vows (fasting, restraint, charity) rather than these extreme practices unless properly qualified.
No vastu or temple-architecture rule appears here; the ritual takeaway is the recognition of severe vow-types (like pañcātapa) as formal austerities within Puranic religious practice.