Matsya Purana — Vrata-Ṣaṣṭhī: The Sixty Sacred Vows
माघमास्युषसि स्नानं कृत्वा दाम्पत्यमर्चयेत् भोजयित्वा यथाशक्त्या माल्यवस्त्रविभूषणः सूर्यलोके वसेत्कल्पं सूर्यव्रतमिदं स्मृतम् //
māghamāsyuṣasi snānaṃ kṛtvā dāmpatyamarcayet bhojayitvā yathāśaktyā mālyavastravibhūṣaṇaḥ sūryaloke vasetkalpaṃ sūryavratamidaṃ smṛtam //
In the month of Māgha, at dawn, having bathed, one should worship a married couple; and, according to one’s capacity, feed them and honor them with garlands, clothing, and ornaments. By this it is said that one dwells in the world of the Sun for a kalpa—this is remembered as the Sūrya-vrata, the vow of the Sun.
This verse does not describe pralaya; it teaches vrata-dharma—how ritual bathing, worship, and charitable honoring lead to a posthumous reward in Sūrya-loka.
It reflects gṛhastha (householder) ethics: begin the day with purity (dawn bath), practice hospitality/charity (feeding), and honor worthy recipients according to means (yathāśaktyā), linking social dharma with spiritual merit.
The significance is ritual (not architectural): Māgha-dawn bathing, worship of a dāmpatya (auspicious couple), and gifting garlands, clothing, and ornaments as part of the Sūrya-vrata observance.