Matsya Purana — Vrata-Ṣaṣṭhī: The Sixty Sacred Vows
पुण्ये ऽह्नि दद्यात्स परं ब्रह्म यात्यपुनर्भवम् एतद्ब्रह्मव्रतं नाम निर्वाणपददायकम् //
puṇye 'hni dadyātsa paraṃ brahma yātyapunarbhavam etadbrahmavrataṃ nāma nirvāṇapadadāyakam //
If one makes the prescribed gift on an auspicious day, one attains the Supreme Brahman and reaches the state of no rebirth. This is called the Brahma-vrata, a vow that bestows the station of nirvāṇa (liberation).
This verse does not discuss pralaya; it teaches mokṣa-oriented dharma—how a vow (brahmavrata) and timely dāna lead to apunarbhava (no rebirth).
It frames dāna performed on a ‘puṇya day’ as a high dharmic duty; for householders and rulers alike, sanctioned giving is presented as a direct means toward spiritual merit culminating in liberation.
No vastu/architecture detail appears here; the ritual takeaway is the emphasis on correct timing (puṇya ahan) and prescribed gifting as part of a named vow (brahmavrata).