Bhagavad Gita Chapter 18 Verse 26
मुक्तसंगः, अनहंवादी, धृत्युत्साहसमन्वितः,
सिद्धयसिद्धयोः, निर्विकारः, कर्ता, सात्त्विकः, उच्यते।।26।।
MuktsangH, anhamvaadi, dhrtyutsaahasamanvitH,
SiddhyasiddhyoH, nirvikaarH, karta, saatvikH, uchyate ||26||
Translation: (Karta) A performer of action / Doer (muktsangH) free from attachment (anhamvaadi) who does not say arrogant words (dhrtyutsaahasamanvitH) endowed with patience and enthusiasm and (siddhyasiddhyoH) in success and failure of the action (nirvikaarH) free from vices (saatvikH) Satvik (uchyate) is said to be. (26)
Translation: A performer of action, free from attachment, who does not say arrogant words, who is endowed with patience and enthusiaism and is free from vices in success and failure of the action, is said to be Satvik.