Matsya Purana — The Gods Seek Śiva’s Refuge: The Cosmic Chariot Prepared for the Burning of T...
नन्दीश्वरश्च भगवाञ् छूलमादाय दीप्तिमान् पृष्ठतश्चापि पार्श्वाभ्यां लोकस्य क्षयकृद्यथा //
nandīśvaraśca bhagavāñ chūlamādāya dīptimān pṛṣṭhataścāpi pārśvābhyāṃ lokasya kṣayakṛdyathā //
And Nandīśvara, the revered lord, radiant as he bore a trident, stood behind and on both flanks—like a power that brings about the destruction of the worlds at the time of dissolution (pralaya).
It depicts a Pralaya-like scene where Nandīśvara, armed with the trident and positioned behind and on both sides, symbolizes the all-encompassing force that brings about the world’s dissolution.
Indirectly, it underscores impermanence: kings and householders should rule and live with dharma and detachment, remembering that worldly power and stability are ultimately subject to dissolution.
While not a Vāstu rule, it is iconographically significant: Nandīśvara/Nandin is portrayed with Śiva’s śūla (trident), a detail relevant to temple imagery and ritual visualization of Śaiva attendants in Puranic tradition.