Matsya Purana — Soma
सौम्या बर्हिषदः काव्या अग्निष्वात्ता इति त्रिधा गृहस्था ये तु यज्वानो हविर्यज्ञार्तवाश्च ये स्मृता बर्हिषदस्ते वै पुराणे निश्चयं गताः //
saumyā barhiṣadaḥ kāvyā agniṣvāttā iti tridhā gṛhasthā ye tu yajvāno haviryajñārtavāśca ye smṛtā barhiṣadaste vai purāṇe niścayaṃ gatāḥ //
The Pitṛs are described in three divisions—Saumya, Barhiṣad, Kāvya, and Agniṣvātta. Those who are householders (gṛhastha), who perform sacrifice (yajvāna), and who are remembered as offering havis and seasonal rites—these, in the Purāṇa, are determined with certainty to be the Barhiṣads.
It does not address pralaya directly; it classifies ancestral beings (Pitṛs) and links the Barhiṣads to householders and Vedic offering-rites, a ritual framework that continues across cosmic cycles.
It ties the Barhiṣad category of Pitṛs to gṛhasthas who perform yajñas, havis-offerings, and seasonal rites—implying that regular domestic-sacrificial discipline sustains ancestral obligations that a king should also uphold and protect through dharma.
The significance is ritual rather than architectural: it emphasizes havis-yajñas and periodic (seasonal) observances, which are foundational to śrāddha and Pitṛ-related rites in the Matsya Purana’s ritual system.