Matsya Purana — Procedure for Going to Prayaga and the Greatness of the Ganga
शुक्लाम्बरधरो नित्यं नियतः संयतेन्द्रियः एकं कालं तु भुञ्जानो मासं भूमिपतिर्भवेत् //
śuklāmbaradharo nityaṃ niyataḥ saṃyatendriyaḥ ekaṃ kālaṃ tu bhuñjāno māsaṃ bhūmipatirbhavet //
Wearing white garments daily, living under discipline with the senses restrained, and eating only once a day—by such a regimen one becomes a lord of the earth for a month.
This verse does not discuss Pralaya; it teaches a discipline-based observance (vrata) and states its worldly fruit—temporary sovereignty—showing how the Purana links ethical restraint to karmic results.
It promotes self-restraint (saṃyatendriya) and regulated living (niyata) as foundations of fitness for rulership; for householders, it prescribes ekakāla-bhojana (one meal at a fixed time) and purity in dress as a dharmic practice with stated rewards.
The ritual takeaway is purity and vrata-observance: wearing clean white garments and regulated eating are common markers of sāttvika discipline used during vows and rites, though no specific Vastu or temple-building rule is stated in this verse.