Matsya Purana — Soma
इत्येष पितृमान्सोमः स्मृतस्तद्वसुधात्मकः कान्तः पञ्चदशैः सार्धं सुधाभृतपरिस्रवैः //
ityeṣa pitṛmānsomaḥ smṛtastadvasudhātmakaḥ kāntaḥ pañcadaśaiḥ sārdhaṃ sudhābhṛtaparisravaiḥ //
Thus is Soma (the Moon) remembered as “Pitṛmān”—the one connected with the Fathers (Pitṛs); he is of the nature of nourishment and the Earth’s sustaining essence, the lovely one, together with the fifteen lunar digits, flowing forth with streams that bear nectar.
Indirectly, it supports the Purāṇic cosmology in which Soma sustains beings through nourishing, nectar-like essence; this is part of the ongoing maintenance of the cosmos rather than a direct Pralaya description.
By identifying Soma as connected with the Pitṛs and as a source of nourishing essence, it aligns with householder duties like pitṛ-yajña (ancestor rites) and offerings (tarpaṇa), which are traditionally linked to lunar cycles.
Ritually, the verse emphasizes Soma, the fifteen lunar kalās, and nectar-like flow—ideas commonly used to time and frame rites (especially Pitṛ-related observances) according to lunar phases, though no direct Vāstu/temple rule is stated here.