Bhagavad Gita 14.16
कर्मणः सुकृतस्याहुः सात्त्विकं निर्मलं फलम्। रजसस्तु फलं दुःखमज्ञानं तमसः फलम्।।14.16।।
karmaṇaḥ sukṛtasyāhuḥ sāttvikaṃ nirmalaṃ phalam| rajasastu phalaṃ duḥkhamajñānaṃ tamasaḥ phalam||14.16||
karmanah sukritasyahuh sattvikam nirmalam phalam rajasastu phalam duhkhamajnanam tamasah phalam14.16
Meaning
The fruit of sattvic action is pure and leads to goodness; the fruit of rajasic action is pain; and the fruit of tamasic action is ignorance.
शुभ कर्म का फल सात्विक और निर्मल कहा गया है; रजोगुण का फल दु;ख और तमोगुण का फल अज्ञान है।
This is verse 16 of 27 in Chapter 14 (Gunatraya Vibhaga Yoga) of the Bhagavad Gita.