Matsya Purana — The Greatness and Procedure of the Aṅgāra
अङ्गारक इति ख्यातिं गमिष्यसि धरात्मज देवलोके ऽद्वितीयं च तव रूपं भविष्यति //
aṅgāraka iti khyātiṃ gamiṣyasi dharātmaja devaloke 'dvitīyaṃ ca tava rūpaṃ bhaviṣyati //
O son of the Earth, you shall attain renown by the name “Aṅgāraka”; and in the world of the gods, your form shall become unrivalled (without a second).
This verse does not discuss pralaya; it focuses on a graha-related identity—declaring the heavenly renown and unrivalled form of Aṅgāraka (Mars), framed as an earth-born being.
Indirectly, it supports the Matsya Purana’s broader concern with auspicious order (ṛta) and heavenly hierarchies: knowing graha identities like Aṅgāraka informs traditional timing/observance practices that householders and rulers used for rituals and state decisions, though no explicit duty is stated here.
No explicit Vastu or temple-building rule appears in this verse; its practical takeaway is primarily astrological/ritual—identifying Aṅgāraka (Mars) as a distinct, celebrated divine presence in devaloka.