Chapter 2 · The Yoga of Knowledge · Krishna said
Bhagavad Gita 2.3 — Stand up, Arjuna
क्लैब्यं मा स्म गमः पार्थ नैतत्त्वय्युपपद्यते। क्षुद्रं हृदयदौर्बल्यं त्यक्त्वोत्तिष्ठ परन्तप ॥
klaibyaṃ mā sma gamaḥ pārtha naitattvayyupapadyate | kṣudraṃ hṛdayadaurbalyaṃ tyaktvottiṣṭha parantapa ||
Meaning
Do not give in to cowardice, Partha; it does not suit you. Shake off this petty weakness of heart and stand up, O scorcher of enemies.