Bhagavad Gita 2.18
अन्तवन्त इमे देहा नित्यस्योक्ताः शरीरिणः । अनाशिनोऽप्रमेयस्य तस्माद्युध्यस्व भारत ॥
antavanta ime dehā nityasyoktāḥ śarīriṇaḥ | anāśino 'prameyasya tasmād yudhyasva bhārata ||
Translation
These bodies of the eternal, indestructible, immeasurable embodied one are said to have an end. Therefore fight, O descendant of Bharata.
Reflection
What action have you been refusing because you think it kills more than it actually does?
Read this verse in its chapter: Chapter Two
The first imperative of the teaching that points back at the original question. Tasmād yudhyasva. Therefore fight. Krishna has built the metaphysical case for four verses; now he lands it on the act in front of them. The bodies end. The one wearing them does not. The conclusion is not callous; it is positional. Arjuna's refusal was anchored in the idea that killing the body kills the man. Krishna disputes the premise, not the cost. The action remains hard. It just stops being grounded in the fear it was grounded in.