Chapter 18 · Liberation through Renunciation · Krishna said
Bhagavad Gita 18.38 — Rajasic happiness
विषयेन्द्रियसंयोगाद्यत्तदग्रेऽमृतोपमम्। परिणामे विषमिव तत्सुखं राजसं स्मृतम् ॥
viṣayendriyasaṃyogādyattadagre'mṛtopamam | pariṇāme viṣamiva tatsukhaṃ rājasaṃ smṛtam ||
Meaning
Happiness that comes from the senses meeting their objects, which feels like nectar at first but turns to poison in the end, is rajasic.