Matsya Purana — Purūravas Beholds the Divine Himalayan River
सुरेभमदसंसिक्तां समन्तात्तु विराजिताम् मध्येन शक्रचापाभां तस्मिन्नहनि सर्वदा //
surebhamadasaṃsiktāṃ samantāttu virājitām madhyena śakracāpābhāṃ tasminnahani sarvadā //
On that day, the place should ever appear resplendent on all sides, as though sprinkled with the intoxicating ichor of noble elephants; and in its midst it should shine with the appearance of Śakra’s bow (a rainbow).
This verse is not about Pralaya; it describes auspicious visible signs (radiance, moisture, rainbow-like appearance) indicating a favorable day/site for ritual or construction activity.
It supports the duty of acting with dharmic prudence—choosing proper timing and auspicious indications before undertaking major works like building, consecration, or public projects.
The verse treats environmental/visual omens—ground appearing pleasantly moistened and a rainbow-like sign at the center—as markers of suitability for Vastu-related rites and construction.