Matsya Purana — Hiranyakashipu’s Boons
सर्वलोकहितं वाक्यं श्रुत्वा देवः प्रजापतिः आश्वासयामास सुरान् सुशीतैर्वचनाम्बुभिः //
sarvalokahitaṃ vākyaṃ śrutvā devaḥ prajāpatiḥ āśvāsayāmāsa surān suśītairvacanāmbubhiḥ //
Hearing those words that were for the welfare of all the worlds, the divine Prajāpati comforted the gods, soothing them with the cool waters of his speech.
It does not describe Pralaya directly; it highlights cosmic order maintained through Prajāpati’s reassuring guidance after hearing a lokahita (world-benefiting) counsel.
It models dharmic leadership: after hearing what benefits all, a leader should steady the community with measured, calming speech—words that cool fear and restore confidence.
No specific Vāstu or ritual rule is stated; the key takeaway is the Purāṇic ideal of “cool speech” as a stabilizing, auspicious force in communal and sacred contexts.