Matsya Purana — The Advent of Narasiṃha and Hiraṇyakaśipu’s Weapon-Assault
अस्त्रं हयशिरश्चैव ब्राह्ममस्त्रं तथैव च नारायणास्त्रमैन्द्रं च सार्पमस्त्रं तथाद्भुतम् //
astraṃ hayaśiraścaiva brāhmamastraṃ tathaiva ca nārāyaṇāstramaindraṃ ca sārpamastraṃ tathādbhutam //
Also (there are) the Hayashiras weapon, the Brahmā-weapon, the Nārāyaṇa weapon, the Indra-weapon, and likewise the Serpent weapon—truly wondrous.
This verse is not about pralaya directly; it functions as a technical enumeration of astras (mantra-empowered divine weapons), reflecting a broader Purāṇic worldview where cosmic order is protected through divinely sanctioned powers.
For kings (kṣatriyas), such lists frame the ideal of righteous protection: power is portrayed as legitimate when rooted in dharma and divine sanction (astra as disciplined, invoked force rather than mere violence).
Ritually, these astras imply mantra-based invocation traditions (astra-mantras) used in protective rites and consecratory contexts; however, no specific Vāstu or temple-building rule is stated in this verse.