Bhagavad Gita 3.30

मयि सर्वाणि कर्माणि संन्यस्याध्यात्मचेतसा।निराशीर्निर्ममो भूत्वा युध्यस्व विगतज्वरः॥

mayi sarvāṇi karmāṇi saṃnyasyādhyātmacetasā |nirāśīrnirmamo 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.

Therefore, surrender your actions to Me, keep your thoughts focused on the Absolute, free from selfishness and without expecting a reward, with a mind free from excitement, begin to fight.

Our plain-language meaning of this verse is waiting for scholar review.