Matsya Purana — The Array of the Gods: Description of the Vaiṣṇava Host and the Lokapālas
जगतः प्रथमं भागं सौम्यं सत्यमयं रथम् ददृशुर्दानवाः सोमं हिमप्रहरणं स्थितम् //
jagataḥ prathamaṃ bhāgaṃ saumyaṃ satyamayaṃ ratham dadṛśurdānavāḥ somaṃ himapraharaṇaṃ sthitam //
The Dānavas beheld Soma—standing firm, his weapon being frost—upon a gentle chariot made of truth, occupying the foremost portion of the world.
Indirectly, it reflects cosmic order rather than Pralaya: Soma is portrayed as a stabilizing, truth-constituted lunar principle occupying a foremost cosmic region, suggesting regulated celestial governance rather than dissolution.
By presenting Soma as “satyamaya” (truth-formed) and “saumya” (gentle), the verse implicitly elevates truthfulness, steadiness, and cooling restraint—virtues central to royal justice (rājadharma) and household discipline (gṛhastha-dharma).
No direct Vāstu rule is stated, but the imagery of a “truth-constituted chariot” and Soma’s cooling power aligns with ritual symbolism where lunar qualities (saumya) are invoked for peace rites (śānti) and cooling/appeasing offerings.