Matsya Purana — The Greatness of Prayaga and Allied Tirthas
महर्षीणामिदं गुह्यं सर्वपापप्रणाशनम् अधीत्य च द्विजो ऽप्येतन् निर्मलः स्वर्गमाप्नुयात् //
maharṣīṇāmidaṃ guhyaṃ sarvapāpapraṇāśanam adhītya ca dvijo 'pyetan nirmalaḥ svargamāpnuyāt //
This secret teaching of the great sages destroys all sins. Even a twice-born (dvija), having studied it, becomes purified and attains heaven.
This verse does not describe Pralaya directly; it functions as a phala-śruti, stating that the sages’ secret teaching removes sin and grants heavenly attainment.
It emphasizes svādhyāya (study/recitation) as a dharmic duty: disciplined learning of authoritative Purāṇic instruction purifies conduct and supports righteous living for householders and rulers alike.
No specific Vāstu or temple-architecture rule is stated in this verse; its ritual takeaway is the merit of studying/reciting the teaching as a purificatory act.