Chapter 14 · The Three Qualities · Krishna said
Bhagavad Gita 14.16 — Fruits of the gunas
कर्मणः सुकृतस्याहुः सात्त्विकं निर्मलं फलम्। रजसस्तु फलं दुःखमज्ञानं तमसः फलम् ॥
karmaṇaḥ sukṛtasyāhuḥ sāttvikaṃ nirmalaṃ phalam | rajasastu phalaṃ duḥkhamajñānaṃ tamasaḥ phalam ||
Meaning
The fruit of good action is said to be pure and sattvic; the fruit of rajas is pain, and the fruit of tamas is ignorance.