Matsya Purana — Inquiry into Taraka’s Slaying and the Prelude to Guha
ऊर्ध्वबाहुः स दैत्येन्द्रो ऽचरदब्दसहस्रकम् कालं कमलपत्त्राक्षः शुद्धबुद्धिर् महातपाः //
ūrdhvabāhuḥ sa daityendro 'caradabdasahasrakam kālaṃ kamalapattrākṣaḥ śuddhabuddhir mahātapāḥ //
That lord of the Daityas, with arms held aloft, performed severe austerity for a full thousand years; lotus-leaf–eyed, pure in mind and understanding, he was a great ascetic.
This verse does not describe pralaya directly; it highlights tapas (austerity) as a cosmic-force practice capable of producing transformative results in later events.
It underscores disciplined self-control and long-term resolve—virtues praised in the Matsya Purana for rulers and householders alike, though here shown through an extreme ascetic model.
No Vastu or temple-architecture rule appears here; the ritual takeaway is the archetype of rigorous vrata-like austerity (ūrdhvabāhu-tapas) performed over a fixed sacred timespan.