Mahabharata 12.186.4

शौचमावश्यकं कृत्वा देवतानां च तर्पणम्धर्ममाहुर्मनुष्याणामुपस्पृश्य नदीं तरेत्

śaucamāvaśyakaṃ kṛtvā devatānāṃ ca tarpaṇamdharmamāhurmanuṣyāṇāmupaspṛśya nadīṃ taret

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