Matsya Purana — The Madana-Dvādaśī Vow and the Birth of the Maruts
एको ऽप्यनेकतामाप यस्मादुदरगो ऽप्यलम् अवध्या नूनमेते वै तस्माद्देवा भवन्त्विति //
eko 'pyanekatāmāpa yasmādudarago 'pyalam avadhyā nūnamete vai tasmāddevā bhavantviti //
Since even a single serpent can assume many forms at will, these beings are surely not to be slain. Therefore, let them indeed become gods.
It reflects a Pralaya-era atmosphere of extraordinary beings and divine interventions—where survival and protection, not destruction, become the priority, and certain beings are declared inviolable.
It supports a dharmic restraint: rulers and householders should avoid rash violence against beings whose nature is mysterious or divinely protected, and should act with discrimination (viveka) and compassion.
No direct Vastu or temple-building rule is stated; the ritual takeaway is the principle of declaring certain beings ‘avadhya’ (not to be harmed), aligning with protective vows and non-violent observances in Purāṇic practice.