Bhagavad Gita 2.18

अन्तवन्त इमे देहा नित्यस्योक्ता: शरीरिण: |
अनाशिनोऽप्रमेयस्य तस्मादुध्यस्व भारत

Translation

Only the material body is perishable; the embodied soul within is indestructible, immeasurable, and eternal. Therefore, fight, O descendent of Bharat.