Mahabharata 6.36.16
कर्मणः सुकृतस्याहुः सात्त्विकं निर्मलं फलम्रजसस्तु फलं दुःखमज्ञानं तमसः फलम्
karmaṇaḥ sukṛtasyāhuḥ sāttvikaṃ nirmalaṃ phalamrajasastu phalaṃ duḥkhamajñānaṃ tamasaḥ phalam
Our plain-language meaning of this verse is waiting for scholar review.
Open in the book