Matsya Purana — Yayāti’s Rule
मातापित्रोर्वचनकृद् धितः पथ्यश्च यः सुतः स पुत्रः पुत्रवद्यश्च वर्तते पितृमातृषु //
mātāpitrorvacanakṛd dhitaḥ pathyaśca yaḥ sutaḥ sa putraḥ putravadyaśca vartate pitṛmātṛṣu //
That son who carries out the words of his mother and father—who is beneficial and acts in a wholesome, proper way—he alone is truly a ‘son’; and likewise, whoever conducts himself toward his parents as a son should, is to be regarded as a son.
This verse is not about Pralaya; it teaches dharma in family life—defining a ‘true son’ by service and obedience to parents.
It frames an ethical standard central to gṛhastha-nīti: honoring and obeying parents. For a householder (and by extension a ruler), self-discipline begins at home—serving elders, following wholesome counsel, and sustaining family order.
No Vāstu or temple-architecture rule is stated here; the ritual takeaway is indirect—pitṛ-mātṛ-sevā (service to parents) is treated as a foundational dharmic practice that supports merit and right conduct.