Mahabharata 12.290.25

मध्यस्थमेकमात्मानं पापं यस्मिन्न विद्यतेद्वितीयं कर्म विज्ञाय नृपते विषयैषिणाम्

madhyasthamekamātmānaṃ pāpaṃ yasminna vidyatedvitīyaṃ karma vijñāya nṛpate viṣayaiṣiṇām

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