Matsya Purana — Origin of Soma
यो वामदेवः प्रथितः पृथिव्याम् अनेकरुद्रार्चितपादपद्मः ततः सशिष्यो गिरिशः पिनाकी बृहस्पतिस्नेहवशानुबद्धः //
yo vāmadevaḥ prathitaḥ pṛthivyām anekarudrārcitapādapadmaḥ tataḥ saśiṣyo giriśaḥ pinākī bṛhaspatisnehavaśānubaddhaḥ //
That Vāmadeva, renowned upon the earth—whose lotus-feet are worshipped by many Rudras—then appeared together with his disciple: Girīśa, bearer of the Pināka bow, bound by the power of affection for Bṛhaspati.
This verse does not describe Pralaya; it highlights revered Shaiva figures and a teacher–disciple setting, emphasizing authority and continuity of sacred knowledge rather than cosmic dissolution.
Indirectly, it supports the Purāṇic ethic that dharma is safeguarded through recognized lineages and disciplined discipleship; kings and householders are urged to honor authentic teachers and uphold traditions grounded in such authoritative transmission.
No explicit Vāstu rule appears here, but the verse establishes ritual authority (Rudra-worship, revered feet, lineage); in Matsya Purana contexts, such authority often underwrites correct temple-ritual practice and iconographic standards.