Matsya Purana — Genealogy of Kaśyapa: Ādityas
बह्वपत्ये महासत्त्वे मारीचस्य परिग्रहे तयोः षष्टिसहस्राणि दानवानामभूत्पुरा //
bahvapatye mahāsattve mārīcasya parigrahe tayoḥ ṣaṣṭisahasrāṇi dānavānāmabhūtpurā //
In the household of Marīci—abounding in offspring and great vitality—there were, from those two spouses, formerly sixty thousand Dānava descendants.
Directly, it does not describe Pralaya; it contributes to the Matsya Purāṇa’s creation-era genealogies by enumerating the proliferation of Dānava descendants within early cosmic lineages.
Indirectly, it frames the Purāṇic ideal of lineage continuity: household unions (parigraha) lead to progeny, a theme later mirrored in royal genealogies where kings uphold dharma through orderly succession and protection of their line.
None is stated in this verse; it is a genealogical count. Architectural (Vāstu) and ritual procedures occur in other thematic sections of the Matsya Purāṇa, not in this line.