Matsya Purana — Dynastic Genealogies: Paurava–Anu Lines
ब्राह्मण्यं प्राप्य काक्षीवान् सहस्रमसृजत्सुतान् कौष्माण्डा गौतमाश्चैव स्मृताः काक्षीवतः सुताः //
brāhmaṇyaṃ prāpya kākṣīvān sahasramasṛjatsutān kauṣmāṇḍā gautamāścaiva smṛtāḥ kākṣīvataḥ sutāḥ //
Having attained Brahminhood, Kākṣīvān begot a thousand sons. Among them, the Kauṣmāṇḍas and the Gautamas are remembered as the sons of Kākṣīvān.
Nothing directly—this verse is genealogical, recording Kākṣīvān’s descendants rather than describing pralaya or cosmic dissolution.
Indirectly, it supports the Purāṇic ideal of preserving lineage and social order (varṇa/āśrama) by documenting how families and learned lines (like the Gautamas) are traditionally traced and remembered.
No explicit Vāstu or ritual procedure is stated; the significance is historical-genealogical, identifying branches (Kauṣmāṇḍa, Gautama) within Kākṣīvān’s progeny.