Matsya Purana — Yadu Lineage
नामतस्तु समासेन शृणुतैषां विवक्षतः प्रथमो नारसिंहस्तु द्वितीयश्चापि वामनः //
nāmatastu samāsena śṛṇutaiṣāṃ vivakṣataḥ prathamo nārasiṃhastu dvitīyaścāpi vāmanaḥ //
Now hear their names in brief, as I am about to state them: the first is Narasiṃha, and the second is Vāmana.
This verse is not describing pralaya directly; it shifts to a concise naming of Vishnu’s incarnations, indicating a doctrinal catalog rather than a flood or dissolution narrative.
Indirectly, it supports dharmic orientation: knowing and reciting the avatara-names is presented as a concise teaching, useful for devotion and right understanding that undergirds righteous conduct for kings and householders.
The verse itself gives no building-rule, but it functions as a header for avatara-identification—information typically used in ritual recitation and in deciding which Vishnu form (e.g., Narasiṃha or Vāmana) is to be installed or worshipped in temple iconography.