Matsya Purana — The Array of the Gods: Description of the Vaiṣṇava Host and the Lokapālas
तमन्वयुर्देवगणा मुनयश्च समाहिताः गीर्भिः परममन्त्राभिस् तुष्टुवुश्च जनार्दनम् //
tamanvayurdevagaṇā munayaśca samāhitāḥ gīrbhiḥ paramamantrābhis tuṣṭuvuśca janārdanam //
The hosts of gods and the sages, composed and intent, followed Him and praised Janārdana with sacred utterances—supreme, mantra-like hymns.
This verse does not directly describe pralaya; it highlights the post-event devotional response—Devas and sages aligning themselves with the divine and praising Vishnu through mantra-like hymns, a typical Purāṇic marker of cosmic order being reaffirmed.
It models dharmic conduct: steadiness of mind (samāhita) and reverent speech (gīr/mantra-stuti). For kings and householders, it implies that righteous action should be accompanied by disciplined attention and regular worship—honoring the sustaining principle embodied by Janārdana.
Architectural rules are not mentioned; ritually, the key point is stuti through “parama-mantra”—suggesting formalized liturgical praise as a valid mode of worship, aligning with Purāṇic ritual culture (recitation, mantra, and hymnody).