Matsya Purana — Soma
यस्मात्प्रसूयते सोमो मासि मासि विशेषतः ततः स्वधाभृतं तद्वै पितॄणां सोमपायिनाम् एतत्तदमृतं सोमम् अवाप मधु चैव हि //
yasmātprasūyate somo māsi māsi viśeṣataḥ tataḥ svadhābhṛtaṃ tadvai pitṝṇāṃ somapāyinām etattadamṛtaṃ somam avāpa madhu caiva hi //
Because Soma is generated anew—month after month, in a special manner—from that (Soma) arises the Svadhā-bearing portion that truly belongs to the Pitṛs, the ancestors who drink Soma. Indeed, it is that Soma, immortal in nature (amṛta), which is obtained; and it is also called “madhu,” the sweet, honey-like essence.
It does not discuss Pralaya directly; it explains a cyclical cosmic-ritual principle: Soma is renewed monthly, and that renewal underwrites the Pitṛs’ share (svadhā) in ancestral rites.
It supports the householder’s (and thus the king’s) duty to maintain Pitṛ-yajña: performing Śrāddha/Tarpaṇa with the proper ancestral portion (svadhā), acknowledging Soma as the sustaining ritual essence for the Pitṛs.
The significance is ritual, not architectural: it identifies Soma as the ‘amṛta/madhu’ essence and the svadhā-bearing share meant for Soma-drinking Pitṛs—key theology behind correct Śrāddha offerings.