Matsya Purana — The Rite of the Vibhūti-Dvādaśī Vow
समाप्यैवं यथाशक्त्या द्वादश द्वादशीः पुनः संवत्सरान्ते लवणपर्वतेन समन्विताम् शय्यां दद्यान्मुनिश्रेष्ठ गुरवे धेनुसंयुताम् //
samāpyaivaṃ yathāśaktyā dvādaśa dvādaśīḥ punaḥ saṃvatsarānte lavaṇaparvatena samanvitām śayyāṃ dadyānmuniśreṣṭha gurave dhenusaṃyutām //
Thus, having duly completed the twelve Dvādaśī observances to the best of one’s ability, at the end of the year, O best of sages, one should present to one’s guru a bed furnished with a “mountain of salt” (a heap of salt) and accompanied by a cow.
This verse is not about pralaya; it prescribes a vrata’s completion rite—specifically a year-end donation to the guru after observing twelve Dvādaśīs.
It frames ideal gṛhastha-dharma: disciplined observance of recurring vows (Dvādaśī) and concluding them with guru-oriented dāna (bed, cow, and salt), performed within one’s means (yathāśaktyā).
The significance is ritual rather than architectural: it specifies the concluding dāna-items—śayyā (bed/couch), lavaṇa-parvata (a symbolic heap of salt), and a cow—as the formal completion offering for the Dvādaśī cycle.