Matsya Purana — Ila–Sudyumna Episode and the Expansion of the Ikṣvāku
पुरुकुत्सस्य पुत्रो ऽभूद् वसुदो नर्मदापतिः सम्भूतिस्तस्य पुत्रो ऽभूत् त्रिधन्वा च ततो ऽभवत् //
purukutsasya putro 'bhūd vasudo narmadāpatiḥ sambhūtistasya putro 'bhūt tridhanvā ca tato 'bhavat //
Purukutsa’s son was Vasuda, lord of the Narmadā region. Vasuda’s son was Sambhūti, and after him Tridhanvā was born.
This verse does not describe pralaya; it preserves dynastic memory by listing royal succession, a common Purāṇic method of anchoring sacred history across ages.
Indirectly, it highlights hereditary kingship and legitimate succession—key to rājadharma—implying continuity of protection and governance over a region (here, associated with the Narmadā).
No Vāstu or ritual procedure is stated in this verse; its focus is genealogical (vamśa), naming rulers and their descent.