Mahabharata 3.43.20

ततोऽर्जुनो हृष्टमना गङ्गायामाप्लुतः शुचिःजजाप जप्यं कौन्तेयो विधिवत्कुरुनन्दनः

tato'rjuno hṛṣṭamanā gaṅgāyāmāplutaḥ śuciḥjajāpa japyaṃ kaunteyo vidhivatkurunandanaḥ

Our plain-language meaning of this verse is waiting for scholar review.