Bhagavad Gita, Chapter 2, Verse 24

This Self cannot be cut, nor burnt, nor wetted, nor dried. Changeless, all-pervading, unmoving, immovable, the Self is eternal.

The soul exists everywhere. It doesn't move. It's older than everything else.

Krishna says this twice on purpose. Some things you have to hear more than once before they actually change how you live, not just what you know.