Matsya Purana — Glory of Prayaga: The Fruit of the Anashaka Fast and the Merit of the Yamuna
यस्त्विमं कल्य उत्थाय पठते च शृणोति च मुच्यते सर्वपापेभ्यः स्वर्गलोकं स गच्छति //
yastvimaṃ kalya utthāya paṭhate ca śṛṇoti ca mucyate sarvapāpebhyaḥ svargalokaṃ sa gacchati //
Whoever rises at dawn and recites this teaching, and also listens to it, is freed from all sins and goes to the heavenly world.
This verse does not discuss Pralaya directly; it is a phalaśruti stating the spiritual fruit of dawn recitation and attentive listening—freedom from sins and attainment of Svarga.
It supports the dharmic discipline of nitya-adhyayana and śravaṇa: a householder (and a king) sustains right conduct by regularly studying and hearing sacred instruction, especially at dawn, which the tradition treats as an auspicious time for self-purification.
No Vāstu or temple-building rule is stated here; the ritual takeaway is the recommended practice of dawn-time pāṭha (recitation) and śravaṇa (listening) as a purificatory observance.