Matsya Purana — Vishnu’s Battle with Mathana
महिषं पतितं दृष्ट्वा भूमौ प्रोवाच केशवः महिषासुर मत्तस्त्वं वधं नास्त्रैरिहार्हसि //
mahiṣaṃ patitaṃ dṛṣṭvā bhūmau provāca keśavaḥ mahiṣāsura mattastvaṃ vadhaṃ nāstrairihārhasi //
Seeing Mahiṣa fallen upon the ground, Keśava spoke: “O Mahiṣāsura, you are not fit to be slain by weapons at my hands here.”
This verse is not about pralaya; it highlights a battle-ethic motif in Purāṇic storytelling—certain beings cannot be slain by ordinary weapons due to boons or cosmic constraints, requiring a dharma-consistent method.
It implies that force must be applied within lawful limits: even when punishing wrongdoing, one should act according to prescribed constraints (maryādā), choosing means that are appropriate rather than merely powerful.
No Vāstu or ritual procedure is stated in this verse; its significance is narrative and ethical, emphasizing the principle of ‘right means’ in confronting adharma.