Matsya Purana — War of Devas and Asuras; Birth of Aurva Fire; Countering Tamasī Māyā through ...
यथायं विहितो धरो मुनीनां शाश्वतः पुरा आर्षं वै सेवतः कर्म वन्यमूलफलाशिनः //
yathāyaṃ vihito dharo munīnāṃ śāśvataḥ purā ārṣaṃ vai sevataḥ karma vanyamūlaphalāśinaḥ //
Thus is this eternal dharma of the sages, ordained from ancient times: they follow the ṛṣi-way of conduct, living on forest roots and fruits.
This verse does not describe pralaya; it preserves continuity of dharma across ages by stating that the sages’ rule is “eternal” and established from ancient times.
Indirectly, it sets a benchmark of austere Ārṣa conduct (simple living, minimal needs) that kings and householders are expected to honor, protect, and support through righteous governance and charity.
No Vāstu or temple-building rule appears here; the ritual takeaway is the ascetic discipline of the rishi-tradition—subsisting on forest roots and fruits as part of prescribed conduct.