Matsya Purana — Brahmā–Gāyatrī as a Divine Pair and the Early Genealogies of Creation
वामदेवस्तु भगवान् असृजन्मुखतो द्विजान् राजन्यान् असृजद्बाह्वोर् विट्छूद्रान् ऊरुपादयोः //
vāmadevastu bhagavān asṛjanmukhato dvijān rājanyān asṛjadbāhvor viṭchūdrān ūrupādayoḥ //
The Blessed Lord Vāmadeva created the twice-born from his mouth; he created the royal class from his arms, and the vaiśyas and śūdras from his thighs and feet.
It describes creation (sarga), presenting society as emerging from the divine/cosmic body; it is not a pralaya verse but a cosmological charter for order after creation.
By locating the rājanya (kṣatriya) in the Lord’s arms, it frames kingship as the ‘arm’ of society—meant for protection, strength, and enforcement of dharma rather than personal power.
No direct vastu or temple rule is stated, but the ‘cosmic body’ mapping is a key Purāṇic idea later echoed in ritual and vastu symbolism (treating the built space as a body with ordered parts).