Matsya Purana — The Advent of Narasiṃha and Hiraṇyakaśipu’s Weapon-Assault
ते दृष्ट्वा रुक्मशैलाभम् अपूर्वां तनुमाश्रितम् विस्मिता दानवाः सर्वे हिरण्यकशिपुश्च सः //
te dṛṣṭvā rukmaśailābham apūrvāṃ tanumāśritam vismitā dānavāḥ sarve hiraṇyakaśipuśca saḥ //
Seeing that unprecedented form—resembling a mountain of gold—all the Dānavas were struck with amazement, and Hiraṇyakaśipu as well.
This verse does not describe pralaya or cosmology; it focuses on a miraculous, unprecedented manifestation whose sheer radiance astonishes the Dānavas and Hiraṇyakaśipu.
Indirectly, it models a Purāṇic ethic: worldly power (even that of Hiraṇyakaśipu) is humbled before a higher, extraordinary reality—an admonition for rulers and householders to cultivate reverence and restraint.
No explicit Vāstu or ritual rule is stated; the imagery “like a golden mountain” is primarily poetic iconographic description (a visual marker of supernatural majesty).