Matsya Purana — The Maheshvara Vow: Śiva-Caturdaśī Vrata
गुरौ सति गुरोर्देयं तदभावे द्विजातये न वित्तशाठ्यं कुर्वीत कुर्वन्दोषात्पतत्यधः //
gurau sati gurordeyaṃ tadabhāve dvijātaye na vittaśāṭhyaṃ kurvīta kurvandoṣātpatatyadhaḥ //
When the guru is alive, the gift should be given to the guru; in his absence, it should be given to a dvijāti, a qualified brāhmaṇa. One should not practice deceit regarding wealth; whoever does so falls downward because of that fault.
This verse does not address pralaya; it teaches dharma—specifically, the rightful recipient of gifts and the karmic danger of deceit in matters of wealth.
It sets a clear rule of patronage and support: honor the living guru with gifts; if the guru is unavailable, support qualified twice-born priests/scholars. It also warns rulers and householders that financial fraud and stinginess disguised as piety lead to moral and karmic decline.
No Vāstu or temple-architecture rule is stated here; the ritual takeaway is about dāna-dharma—properly directing offerings and maintaining honesty so that religious giving remains valid and meritorious.