Bhagavad Gita · Chapter 2: The Path of Understanding

Bhagavad Gita 2.13

dehino'sminyathā dehe kaumāraṃ yauvanaṃ jarā | tathā dehāntaraprāptirdhīrastatra na muhyati ||

Just as the embodied self passes through childhood, youth, and old age in this body, so it passes into another body. A steady person is not confused by this.

Modern context

Krishna argues from something everyone has lived through. The body you had as a child is gone, and you did not die with it. You have already survived several complete changes of body while remaining yourself. Death, he says, is one more change of the same kind.