Matsya Purana — Purūravas Beholds the Divine Himalayan River
यस्यास्तीररुहैः काशैः पूर्णैश्चन्द्रांशुसंनिभैः राजते विविधाकारै रम्यतीरं महाद्रुमैः या सदा विविधैर्विप्रैर् देवैश्चापि निषेव्यते //
yasyāstīraruhaiḥ kāśaiḥ pūrṇaiścandrāṃśusaṃnibhaiḥ rājate vividhākārai ramyatīraṃ mahādrumaiḥ yā sadā vividhairviprair devaiścāpi niṣevyate //
Her lovely bank shines with reeds of kāśa grass along the shore, bright as the rays of the full moon, and with great trees of many forms. She is ever frequented and revered by many kinds of brāhmaṇas and even by the gods.
This verse is not about Pralaya; it praises a sacred riverbank/tīrtha, emphasizing its natural radiance and divine-human visitation as a marker of sanctity.
Indirectly, it supports dharma through tīrtha-sevā: householders (and rulers) are encouraged in Purāṇic ethics to honor holy places, host learned brāhmaṇas, and uphold religious patronage connected to such revered sites.
Ritually, the key point is tīrtha-mahattva: a bank continually visited by vipras and devas is fit for rites like bathing, offerings, and worship; no explicit Vāstu or temple-measurement rule is stated in this verse.