BG 18.38
विषयेन्द्रियसंयोगाद्यत्तदग्रेऽमृतोपमम् ।
परिणामे विषमिव तत्सुखं राजसं स्मृतम् ॥
परिणामे विषमिव तत्सुखं राजसं स्मृतम् ॥
viṣayendriya-saṁyogād yat tad agre ’mṛtopamam
pariṇāme viṣam iva tat sukhaṁ rājasaṁ smṛtam
pariṇāme viṣam iva tat sukhaṁ rājasaṁ smṛtam
Word-for-word meanings
tat — that [happiness]; yat — which; saṁyogāt — [is derived] from contact; indriya — [of] the senses; viṣaya — [with] the sense objects; amṛta-upamam — [and which is] like nectar; agre — in the beginning; viṣam iva — [but] like poison; pariṇāme — in the end; tat — that; sukham — happiness; smṛtam — is considered; rājasam — as rājasika.
Translation
That happiness which is derived from contact of the senses with their objects, and which appears like nectar at first but like poison in the end, is considered as rājasika.