Matsya Purana — The Aśūnyaśayana Vrata
भगवन्पुरुषस्येह स्त्रियाश्च विरहादिकम् शोकव्याधिभयं दुःखं न भवेद्येन तद्वद //
bhagavanpuruṣasyeha striyāśca virahādikam śokavyādhibhayaṃ duḥkhaṃ na bhavedyena tadvada //
O Blessed Lord, please explain that by which, in this world, a man and a woman may not fall into grief, illness, fear, and suffering arising from separation and similar causes.
This verse does not address pralaya directly; it frames a moral-spiritual inquiry about preventing human suffering (grief, illness, fear) caused by separation and related worldly conditions.
As an ethical question posed to Bhagavān, it reflects the king/householder’s concern for well-being and steadiness of mind—seeking guidance to reduce sorrow and fear that disturb dharma, family stability, and righteous governance.
No Vāstu or temple-building detail is stated in this verse; the focus is psychological and ethical—requesting a teaching or method that prevents distress arising from separation.