Matsya Purana — Glory of Prayaga: The Fruit of the Anashaka Fast and the Merit of the Yamuna
अहीनाङ्गो ऽप्यरोगश्च पञ्चेन्द्रियसमन्वितः अश्वमेधफलं तस्य गच्छतस्तु पदे पदे //
ahīnāṅgo 'pyarogaśca pañcendriyasamanvitaḥ aśvamedhaphalaṃ tasya gacchatastu pade pade //
Even if he has no bodily deficiency, he remains free from disease and endowed with all five senses; for him, the merit of an Aśvamedha sacrifice accrues at every step as he proceeds.
This verse does not discuss Pralaya; it is a merit-result (phala-śruti) statement promising health and Aśvamedha-level merit through a specified righteous proceeding.
It elevates accessible dharmic practice—walking/undertaking a prescribed observance—by equating its merit to royal-scale yajñas, implying that even householders (and kings) gain great fruit through disciplined, lawful conduct rather than only costly sacrifices.
The ritual significance is the comparison to Aśvamedha: the text frames the act of proceeding in a prescribed dharmic context as generating yajña-like merit “at every step,” a common Purāṇic way to magnify vrata/pilgrimage efficacy.