Matsya Purana — The Kalyāṇa-Saptamī
शर्करासप्तमीं पुण्यां तथा कमलसप्तमीम् मन्दारसप्तमीं तद्वच् छुभदां शुभसप्तमीम् //
śarkarāsaptamīṃ puṇyāṃ tathā kamalasaptamīm mandārasaptamīṃ tadvac chubhadāṃ śubhasaptamīm //
Likewise, one should observe the meritorious Śarkarā-saptamī (Sugar-Saptamī), the Kamala-saptamī (Lotus-Saptamī), the Mandāra-saptamī, and similarly the auspicious, boon-bestowing Śubha-saptamī.
This verse does not discuss Pralaya; it enumerates specific Saptamī (seventh lunar day) vratas, emphasizing ritual merit (puṇya) and auspicious results.
It supports the householder’s dharma through calendrical observances: performing named Saptamī vratas is presented as a practical means to cultivate merit and auspicious outcomes, a model also applicable to rulers who uphold public dharma.
The significance is ritual (vrata) rather than architectural: the verse lists themed Saptamī observances (Sugar, Lotus, Mandāra, Śubha) understood as distinct devotional/ritual modes aimed at generating auspicious merit.