Bhagavad Gita 2.18

The material bodies that this Eternal, Indestructible, and Immeasurable Spirit inhabits are all finite; therefore, fight, O valiant man!

अन्तवन्त इमे देहा नित्यस्योक्ताः शरीरिणः।
अनाशिनोऽप्रमेयस्य तस्माद्युध्यस्व भारत॥

antavanta ime dehā nityasyoktāḥ śarīriṇaḥ|
anāśino'prameyasya tasmādyudhyasva bhārata||

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