Verse 2.18

अन्तवन्त इमे देहा नित्यस्योक्ताः शरीरिणः। अनाशिनोऽप्रमेयस्य तस्माद्युध्यस्व भारत।।2.18।।

antavanta ime dehā nityasyoktāḥ śharīriṇaḥ anāśhino ’prameyasya tasmād yudhyasva bhārata

Meaning

These bodies? Yeah, they're totally finite, even tho the real you—the Self—is eternal, indestructible, and, like, *infinite*. So fight, Arjuna. No cap.

Commentary

Yo, Krishna's schooling Arjuna on this eternal, indestructible, immeasurable Self vibe. He's dropping truth bombs to snap Arjuna out of his emo, grief-stricken, clueless funk, so Arjuna can get his fight on.