Matsya Purana — Nārāyaṇa as Haṃsa in the Cosmic Ocean: Vedic Yajña-Puruṣa and Mārkaṇḍeya’s Vi...
एवं वर्षशतं साग्रं मार्कण्डेयस्य धीमतः चरतः पृथिवीं सर्वां न कुक्ष्यन्तः समीक्षितः //
evaṃ varṣaśataṃ sāgraṃ mārkaṇḍeyasya dhīmataḥ carataḥ pṛthivīṃ sarvāṃ na kukṣyantaḥ samīkṣitaḥ //
Thus, for a full hundred years and more, the wise Markandeya wandered over the entire earth; yet his belly was never seen to be filling (as with ordinary eating).
It does not directly describe Pralaya; it highlights ascetic power (tapas) and extraordinary yogic restraint, themes often used in Puranas to frame cosmic teachings.
By portraying Markandeya’s self-mastery and detachment, it implicitly sets an ethical ideal: rulers and householders should honor sages and cultivate restraint, charity, and discipline rather than indulgence.
No Vastu or temple-architecture rule is stated here; the verse is a hagiographic note emphasizing tapas and the marvel of a sage’s sustained wandering.