Matsya Purana — Ritual Bathing
एवं स्नात्वा ततः पश्चाद् आचम्य च विधानतः उत्थाय वाससी शुक्ले शुद्धे तु परिधाय वै ततस्तु तर्पणं कुर्यात् त्रैलोक्याप्यायनाय वै //
evaṃ snātvā tataḥ paścād ācamya ca vidhānataḥ utthāya vāsasī śukle śuddhe tu paridhāya vai tatastu tarpaṇaṃ kuryāt trailokyāpyāyanāya vai //
Thus, having bathed, and thereafter performing ācamana according to the prescribed rule, one should rise and put on clean, pure white garments. Then one should perform tarpaṇa (the rite of libations), for the nourishment and satisfaction of the three worlds.
This verse is not about pralaya; it teaches daily ritual discipline—post-bath purification and tarpaṇa—described as sustaining harmony across the three worlds (trailokya).
It lays down a standard nitya-karma sequence (snāna → ācamana → clean white clothing → tarpaṇa), applicable especially to householders and rulers who are expected to uphold dharma through regular purificatory rites.
The significance is ritual rather than architectural: it specifies procedural purity (vidhānataḥ), the wearing of clean white garments, and the performance of tarpaṇa as a world-sustaining rite.