Bhagavad Gita 18.42 Chapter 18, Verse 42

शमो दमस्तपः शौचं क्षान्तिरार्जवमेव च ।
ज्ञानं विज्ञानमास्तिक्यं ब्रह्मकर्म स्वभावजम् ॥१८.४२॥

śamo damastapaḥ śaucaṃ kṣāntirārjavameva ca
jñānaṃ vijñānamāstikyaṃ brahmakarma svabhāvajam

Meaning

Calm, self-control, austerity, purity, patience, uprightness, knowledge, realisation and faith in God are the natural duties of a Brahmin.

Newly written by Bhajan Dhun — scholarly review in progress.

Reference: Bhagavad Gita 18.42 (Chapter 18, Liberation through Renunciation (Moksha Sannyasa Yoga), Verse 42)