Matsya Purana — The Attendant Hosts of the Sun and Moon: Monthly Gaṇas
अपां सारमयस्येन्दो रसमात्रात्मकस्य च पिबन्त्यम्बुमयं देवा मधु सौम्यं तथामृतम् //
apāṃ sāramayasyendo rasamātrātmakasya ca pibantyambumayaṃ devā madhu saumyaṃ tathāmṛtam //
O gentle one, the gods drink what is made of water—the honey-like Soma and also amṛta (nectar); for Soma (the Moon), formed from the essence of the waters, is in nature pure rasa (sap) alone.
It frames “waters” as a primordial substrate whose essence becomes Soma and amṛta—hinting at a cosmology where life-sustaining essences arise from ap (waters), a key element repeatedly emphasized in creation and re-creation cycles.
Indirectly, it supports the dharmic ideal of sustaining life through proper nourishment and ritual order: rulers and householders uphold yajña/offerings where Soma symbolism represents vitality, lawful enjoyment, and the maintenance of cosmic balance.
Ritually, it points to Soma/amṛta as sacred ‘essence’ (rasa) tied to offerings and consecratory contexts; while not a Vāstu rule, it reinforces the purity and primacy of water-based sanctifying substances used in temple and rite procedures.