Matsya Purana — Maya’s War-Counsel to the Danavas and the Moonlit Revels in Tripura
कल्पं स्थास्यति वा खस्थं त्रिपुरं शाश्वतं ध्रुवम् अदानवं वा भविता नारायणपदत्रयम् //
kalpaṃ sthāsyati vā khasthaṃ tripuraṃ śāśvataṃ dhruvam adānavaṃ vā bhavitā nārāyaṇapadatrayam //
The sky-borne Tripura will endure for a kalpa—eternal and steadfast; and likewise the threefold station of Nārāyaṇa shall remain free from the Daityas (demons).
It emphasizes endurance across cosmic time (a kalpa): certain divine/celestial abodes—Tripura and Nārāyaṇa’s threefold station—are described as stable and protected, implying continuity even as worlds undergo cycles.
Indirectly, it frames an ethical ideal of “protected order”: just as Nārāyaṇa’s abode is said to be free from demonic forces, a king is expected to maintain a realm safeguarded from adharma and हिंसा (violent disorder) through righteous governance.
While not a Vāstu rule, it uses the imagery of enduring celestial fortresses/abodes (Tripura, Nārāyaṇa-pada) that become models in Purāṇic thought for consecrated space—ritually protected, stable, and “free from hostile forces.”