Matsya Purana — The Terror of Tripura and the Gods’ Hymn to Śiva
ततो देवैश्च सम्प्रोक्तो यास्याम इति दुःखितैः पितामहश्च तैः सार्धं भवसंसदमागतः //
tato devaiśca samprokto yāsyāma iti duḥkhitaiḥ pitāmahaśca taiḥ sārdhaṃ bhavasaṃsadamāgataḥ //
Then, urged on by the sorrowing gods—saying, “Let us go”—the Grandfather (Brahmā) too, together with them, went to the assembly-hall of Bhava (Śiva).
This verse does not describe Pralaya directly; it depicts a crisis-response motif where distressed Devas seek intervention through Brahmā and then approach Śiva’s divine assembly for resolution.
Indirectly, it models dharmic governance: when a community faces distress, leaders should consult wise authorities and proceed collectively toward a lawful, higher forum to resolve the problem rather than acting rashly.
No explicit Vāstu or ritual procedure is stated; the key term is “saṃsad” (assembly hall), indicating the idea of a formal council-space—useful as contextual framing for later Matsya Purana discussions on sabhā/mandapa and sacred or royal halls.