Matsya Purana — Paurava Genealogy: Bharata
मेधातिथिः सुतस्तस्य तस्मात्काण्वायना द्विजाः अजमीढस्य भूमिन्यां जज्ञे बृहदनुर् नृपः //
medhātithiḥ sutastasya tasmātkāṇvāyanā dvijāḥ ajamīḍhasya bhūminyāṃ jajñe bṛhadanur nṛpaḥ //
Medhātithi was his son; from him arose the Kāṇvāyana brahmins. And from Bhūminī, the wife of King Ajamīḍha, was born the ruler Bṛhadanū.
This verse does not address pralaya; it records lineage—how a brahminical clan (Kāṇvāyana) and a king (Bṛhadanū) arise through succession and birth.
Indirectly, it frames dharma through continuity of lineage: kingship and social orders are presented as maintained by legitimate descent, marriage, and acknowledged offspring—key concerns for householders and rulers in Purāṇic ethics.
No Vāstu or ritual procedure is specified here; the verse is purely genealogical, identifying ancestral origins of a brahmin lineage and a royal descendant.