For example Bhagavad-gita as it is 2.20
For the soul there is neither birth nor death at any time. He has not come into being, does not come into being, and will not come into being. He is unborn, eternal, ever-existing and primeval. He is not slain when the body is slain.
There are many such verses which describe the eternal individuality of the soul. Can we elaborate on more such comforting verses?