Matsya Purana — Mandāra-Saptamī Vrata
*ईश्वर उवाच अथातः सम्प्रवक्ष्यामि सर्वपापप्रणाशिनीम् सर्वकामप्रदां रम्यां नाम्ना मन्दारसप्तमीम् //
*īśvara uvāca athātaḥ sampravakṣyāmi sarvapāpapraṇāśinīm sarvakāmapradāṃ ramyāṃ nāmnā mandārasaptamīm //
The Lord said: “Now I shall fully describe the delightful observance called Mandāra-Saptamī—one that destroys all sins and grants every desired aim.”
This verse does not discuss Pralaya; it introduces a vrata (Mandāra-Saptamī) praised for destroying sin and granting desired results.
It frames a dharmic practice (a vow/fast) aimed at purification and fulfillment of legitimate aims—relevant to householders and rulers alike as part of righteous conduct and self-discipline.
The ritual significance is the announcement of a specific observance—Mandāra-Saptamī—presented as a structured vrata with promised fruits (sin-destruction and wish-fulfillment), setting up the procedural details in subsequent verses.