Bhagavad Gita 2.3

क्लैब्यं मा स्म गमः पार्थ नैतत्त्वय्युपपद्यते।क्षुद्रं हृदयदौर्बल्यं त्यक्त्वोत्तिष्ठ परन्तप ॥२.३॥

klaibyaṃ mā sma gamaḥ pārtha naitattvayyupapadyatekṣudraṃ hṛdayadaurbalyaṃ tyaktvottiṣṭha parantapa

Do not yield to impotence, O Arjuna, son of Pritha. It does not befit you. Cast off this mean weakness of the heart! Stand up, O conqueror of foes!

गीता