Matsya Purana — The Sarasvata Vrata: Vow for Sweet Speech
यो यद्भक्तः पुमान्कुर्याद् एतद्व्रतमनुत्तमम् तद्वासरादौ सम्पूज्य विप्रानेतान्समाचरेत् //
yo yadbhaktaḥ pumānkuryād etadvratamanuttamam tadvāsarādau sampūjya viprānetānsamācaret //
Whatever deity a man is devoted to, he should undertake this unsurpassed vow; and at the beginning of its appointed day, having duly worshipped these Brahmanas, he should carry out the observance accordingly.
This verse does not discuss Pralaya; it focuses on Dharma through vrata-observance, emphasizing correct initiation of the vow by honoring Brahmanas.
It frames a general duty for practitioners (including householders and rulers): perform vows aligned with one’s devotion, and begin them with respectful worship and gifting/honoring of Brahmanas—an ethical norm in Purāṇic Dharma.
The significance is ritual (not architectural): a vrata should commence on its designated day with proper pūjā/honoring of Brahmanas, establishing purity, legitimacy, and auspiciousness for the observance.