Matsya Purana — Cosmic Creation: Emergence of the Great Elements and the Navel-Lotus
यत्पृथिव्यां द्विजेन्द्राणां तपसा भावितात्मनाम् ज्ञानं वृष्टं तु विश्वार्थे योगिनां याति मुख्यताम् //
yatpṛthivyāṃ dvijendrāṇāṃ tapasā bhāvitātmanām jñānaṃ vṛṣṭaṃ tu viśvārthe yogināṃ yāti mukhyatām //
That knowledge which, upon the earth, is showered forth for the good of the world by the foremost of the twice-born—whose selves are refined by austerity—becomes the highest pursuit for yogins.
It does not describe Pralaya directly; it emphasizes how world-benefiting spiritual knowledge arises through tapas and becomes central to the yogic path.
It implies that rulers and householders should honor and support tapasvī sages and their teachings, since such knowledge is presented as being “for the welfare of the world” and guides right conduct (dharma).
No specific Vāstu or ritual procedure is stated; the verse frames tapas-born jñāna as the highest priority, which can underwrite ritual purity and correct intention behind rites rather than technical architectural rules.