Matsya Purana — Dynastic Genealogies: Paurava–Anu Lines
दृष्ट्वा स्पृष्ट्वा पितुर्वै स ह्य् उपविष्टश्चिरं तपः ततः कालेन महता तपसा भावितस्तु सः //
dṛṣṭvā spṛṣṭvā piturvai sa hy upaviṣṭaściraṃ tapaḥ tataḥ kālena mahatā tapasā bhāvitastu saḥ //
Having seen and touched his father, he then sat down and undertook austerity (tapas) for a long time; and in the course of great time, he became matured and inwardly transformed by that mighty tapas.
This verse does not describe Pralaya directly; it emphasizes tapas over long time as a force that “forms” or ripens a person, a theme often used in Puranas to explain how sages or heirs gain spiritual power before major cosmic or historical events.
It models pitṛ-satkara (respect to one’s father/elders) followed by disciplined self-restraint; for householders and rulers, it implies that legitimate authority and success should be grounded in humility, reverence, and sustained personal discipline.
No Vāstu or temple-building rule is stated here; the ritual takeaway is the primacy of tapas (austerity) and proper conduct toward one’s father as preparatory discipline before undertaking major vows or sacred works.