Matsya Purana — Manvantaras
प्रवर्तयन्ति तेषां वै ब्रह्मस्तोत्रं पुनः पुनः एवं मन्त्रगुणानां तु समुत्पत्तिश्चतुर्विधा //
pravartayanti teṣāṃ vai brahmastotraṃ punaḥ punaḥ evaṃ mantraguṇānāṃ tu samutpattiścaturvidhā //
For them indeed, the Brahma-hymn is set in motion again and again—repeatedly recited and applied. Thus, the manifestation of the qualities of mantras is fourfold.
It does not describe Pralaya directly; it teaches ritual efficacy—mantric power becomes manifest through repeated recitation, and those mantra-qualities are said to arise in four distinct modes.
It supports the duty of sustaining dharma through correct rites: a king or householder should ensure disciplined, repeated stotra/mantra practice, because mantra potency is not assumed but ‘arises’ through proper application.
Ritually, it emphasizes repeated Brahma-stotra as a means to activate mantra-guṇas—relevant as a general principle for consecrations and worship procedures that often accompany temple-building and installation rites.