Matsya Purana — Vrata-Ṣaṣṭhī: The Sixty Sacred Vows
हैमं पलद्वयादूर्ध्वं रथमश्वयुगान्वितम् ददत्कृतोपवासः स्याद् दिवि कल्पशतं वसेत् कल्पान्ते राजराजः स्याद् अश्वव्रतमिदं स्मृतम् //
haimaṃ paladvayādūrdhvaṃ rathamaśvayugānvitam dadatkṛtopavāsaḥ syād divi kalpaśataṃ vaset kalpānte rājarājaḥ syād aśvavratamidaṃ smṛtam //
One who, having observed a fast, donates a golden chariot furnished with a yoke of horses—whose gold exceeds two palas—dwells in heaven for a hundred kalpas; and at the end of a kalpa becomes a king of kings. This is remembered as the Aśvavrata (the horse-vow).
It uses the cosmic time unit “kalpa” to measure merit’s duration (hundreds of kalpas in heaven), but it is not a Pralaya narrative; it is a dharma teaching framed in cosmic chronology.
It promotes dāna (charitable gifting) combined with upavāsa (fasting) as a householder’s and ruler’s dharmic practice, promising prosperity and sovereignty (rāja-rāja status) as the karmic fruit of generous, ritually disciplined giving.
The significance is ritual rather than architectural: the Aśvavrata centers on a prescribed donation—specifically a golden chariot with horse-yoke—performed with fasting, illustrating Matsya Purana’s vrata-based method for accruing merit.