Matsya Purana — War of Devas and Asuras; Birth of Aurva Fire; Countering Tamasī Māyā through ...
बहूनि विप्र गोत्राणि मुनीनां भावितात्मनाम् एकदेहानि तिष्ठन्ति विविक्तानि विना प्रजाः //
bahūni vipra gotrāṇi munīnāṃ bhāvitātmanām ekadehāni tiṣṭhanti viviktāni vinā prajāḥ //
O brāhmaṇa, many gotras (lineages) of self-disciplined sages continue as single-bodied (solitary) lines—dwelling in seclusion, without offspring.
It does not directly describe Pralaya; it highlights how certain rishi-gotras persist through ascetic continuity—remaining secluded and not expanding through progeny.
It contrasts householders—who sustain society through progeny and social duties—with renunciant sages whose dharma is seclusion and self-cultivation; a king should protect and honor both orders appropriately.
No explicit Vastu or temple rule appears; the ritual takeaway is the ideal of viveka/vivikta-vāsa (secluded dwelling) as a recognized ascetic mode within Purāṇic dharma.