Bhagavad Gita 2.30

Do not be anxious about these armies; the spirit in man is imperishable.

देही नित्यमवध्योऽयं देहे सर्वस्य भारत।
तस्मात्सर्वाणि भूतानि न त्वं शोचितुमर्हसि॥

dehī nityamavadhyo'yaṃ dehe sarvasya bhārata|
tasmātsarvāṇi bhūtāni na tvaṃ śocitumarhasi||

English translation (above): Shri Purohit Swami (1935), public domain. Sanskrit text via github.com/gita/gita (Unlicense).