Chapter 18 · Liberation through Renunciation · Krishna said
Bhagavad Gita 18.26 — Sattvic doer
मुक्तसङ्गोऽनहंवादी धृत्युत्साहसमन्वितः। सिद्ध्यसिद्ध्योर्निर्विकारः कर्ता सात्त्विक उच्यते ॥
muktasaṅgo'nahaṃvādī dhṛtyutsāhasamanvitaḥ | siddhyasiddhyornirvikāraḥ kartā sāttvika ucyate ||
Meaning
A doer who is free from attachment, does not boast, is full of patience and enthusiasm, and stays the same in success and failure, is sattvic.