Matsya Purana — Procedure for Going to Prayaga and the Greatness of the Ganga
यस्तु पुत्रांस्तथा बालान् स्नापयेत् पाययेत्तथा यथात्मना तथा सर्वं दानं विप्रेषु दापयेत् //
yastu putrāṃstathā bālān snāpayet pāyayettathā yathātmanā tathā sarvaṃ dānaṃ vipreṣu dāpayet //
But whoever bathes his sons and young children and likewise provides them drink should, according to his own means, have all charitable gifts bestowed upon the Brāhmaṇas.
This verse does not discuss Pralaya; it teaches gṛhastha-dharma—personal conduct, care of dependents, and proper channels of charity.
It frames a householder’s (and by extension a ruler’s) duty as twofold: nurture one’s dependents (sons/children through bathing and drinking—basic welfare and purity) and then give charity in proportion to one’s capacity, directing gifts to Brāhmaṇas as custodians of ritual learning.
The ritual note is the emphasis on snāna (bathing/purification) and regulated dāna (charitable giving), not Vāstu; it supports domestic purity and merit through properly directed gifts.