Mahabharata 3.32.5
न धर्मफलमाप्नोति यो धर्मं दोग्धुमिच्छतियश्चैनं शङ्कते कृत्वा नास्तिक्यात्पापचेतनः
na dharmaphalamāpnoti yo dharmaṃ dogdhumicchatiyaścainaṃ śaṅkate kṛtvā nāstikyātpāpacetanaḥ
Our plain-language meaning of this verse is waiting for scholar review.
Open in the book