Matsya Purana — The Greatness of the Vibhūti-Dvādaśī Vow: Pushkara
इति जागरणं ताभ्यां तत्प्रसङ्गादनुष्ठितम् प्रभाते च तदा दत्ता शय्या सलवणाचला //
iti jāgaraṇaṃ tābhyāṃ tatprasaṅgādanuṣṭhitam prabhāte ca tadā dattā śayyā salavaṇācalā //
Thus, prompted by that very occasion, the two of them duly observed the night‑vigil (jāgaraṇa). And at dawn, a bed was then given in charity—complete with salt and provisions (the ‘salted mountain’ offering).
This verse does not address pralaya or cosmology; it focuses on dharmic practice—keeping a ritual night‑vigil and performing charity at dawn.
It presents a model of household/lay dharma: undertake a prescribed observance (jāgaraṇa) and conclude it with timely dāna (charity) at daybreak, emphasizing completion of vows through giving.
Ritually, it encodes a vrata sequence: night‑vigil followed by dawn‑time donation (śayyā-dāna). While not Vāstu-specific, it reflects Purāṇic ritual completeness—gifts given with necessary adjuncts (e.g., salt/provisions) rather than as bare items.