Bhagavad Gita 2.20

न जायते मृयते वा कदाचि नायं भूत्वा भविता वा न भूय: |
अजो नित्यः शाश्वतोऽयं पुराणो न हन्यते हन्यमाने शरीरे

Translation

The soul is neither born, nor does it ever die; nor having once existed, does it ever cease to be. The soul is without birth, eternal, immortal, and ageless. It is not destroyed when the body is destroyed.