Mahabharata 3.83.63

गङ्गायां तु नरः स्नात्वा ब्रह्मचारी समाहितःविधूतपाप्मा भवति वाजपेयं च विन्दति

gaṅgāyāṃ tu naraḥ snātvā brahmacārī samāhitaḥvidhūtapāpmā bhavati vājapeyaṃ ca vindati

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