Mahabharata 3.80.71
नर्मदामथ चासाद्य नदीं त्रैलोक्यविश्रुताम्तर्पयित्वा पितॄन्देवानग्निष्टोमफलं लभेत्
narmadāmatha cāsādya nadīṃ trailokyaviśrutāmtarpayitvā pitṝndevānagniṣṭomaphalaṃ labhet
Our plain-language meaning of this verse is waiting for scholar review.
Open in the book