Matsya Purana — Vrata-Ṣaṣṭhī: The Sixty Sacred Vows
व्रतान्ते विप्रमिथुनं पूज्यं धेनुत्रयान्वितम् वृक्षं हिरण्मयं दद्यात् सोऽश्वमेधफलं लभेत् एतत् कीर्तिव्रतं नाम भूतिकीर्तिफलप्रदम् //
vratānte vipramithunaṃ pūjyaṃ dhenutrayānvitam vṛkṣaṃ hiraṇmayaṃ dadyāt so'śvamedhaphalaṃ labhet etat kīrtivrataṃ nāma bhūtikīrtiphalapradam //
At the conclusion of the vow, having duly honoured a Brahmin couple together with three cows, one should gift a golden tree. By doing so, one attains the fruit of the Aśvamedha sacrifice. This is called the Kīrti-vrata, bestowing the results of prosperity and lasting fame.
This verse does not discuss Pralaya; it focuses on vrata completion rites and the merit gained through specific gifts (dāna).
It prescribes an end-of-vow duty (vratānta-kriyā): honouring a Brahmin couple and donating cows and a golden tree—classic householder/kingly dharma emphasizing charity, patronage of learned Brahmins, and merit-making acts.
The significance is ritual rather than architectural: the prescribed dāna includes a symbolic “golden tree” (hiraṇmaya-vṛkṣa), alongside three cows, as a high-merit concluding offering equated with Aśvamedha results.