Matsya Purana — Saptamī Sacred Bath and the Mṛtavatsābhiṣeka Rite for Pacifying Misfortune an...
बालानां मरणं यत्र क्षीरपाणां प्रदृश्यते तद्वद्वृद्धातुराणां च यौवने चापि वर्तताम् //
bālānāṃ maraṇaṃ yatra kṣīrapāṇāṃ pradṛśyate tadvadvṛddhāturāṇāṃ ca yauvane cāpi vartatām //
Where the death of children—still drinking milk—is seen, in the same way the death of the aged and the sick is also seen; and even those who are in youth may meet with it.
It does not describe cosmic Pralaya directly; it highlights a “personal pralaya” theme—death can come at any age—urging awareness of impermanence.
By stressing life’s uncertainty, it supports dharmic urgency: a king should rule justly without delay, and a householder should practice charity, truthfulness, and ritual duties while time remains.
No Vastu or iconographic rule is stated; the ritual takeaway is motivational—perform prescribed rites and meritorious acts promptly, since death is not confined to old age or sickness.