Bhagavad Gita 3.30

मयि सर्वाणि कर्माणि संन्यस्याध्यात्मचेतसा।निराशीर्निर्ममो भूत्वा युध्यस्व विगतज्वरः ॥३.३०॥

mayi sarvāṇi karmāṇi saṃnyasyādhyātmacetasānirāśīrnirmamo bhūtvā yudhyasva vigatajvaraḥ

Renouncing all actions in Me, with the mind centered on the Self, free from hope and egoism, and from mental fever, fight thou.

गीता