Matsya Purana — Genealogy of the Śūra–Vasudeva
देवभागसुतश्चापि नाम्नासाव् उद्धवः स्मृतः पण्डितं प्रथमं प्राहुर् देवश्रवःसमुद्भवम् //
devabhāgasutaścāpi nāmnāsāv uddhavaḥ smṛtaḥ paṇḍitaṃ prathamaṃ prāhur devaśravaḥsamudbhavam //
And Devabhāga’s son, too, was remembered by the name Uddhava. They declare the foremost of the learned to be the one born from Devaśravas.
This verse does not discuss Pralaya; it is part of a genealogical enumeration, recording names and descent (Devabhāga → Uddhava; and a notable learned figure descended from Devaśravas).
Indirectly, it supports the Purāṇic ideal that rulers and householders preserve tradition by remembering lineage, honoring learned persons (paṇḍitas), and maintaining continuity of sacred knowledge through reputable families and teachers.
No Vāstu/temple-building or ritual procedure is specified here; the verse is primarily on lineage and the recognition of a foremost learned person.