न जायते म्रियते वा कदाचिन् नायं भूत्वा भविता वा न भूयः। अजो नित्यः शाश्वतोऽयं पुराणो न हन्यते हन्यमाने शरीरे॥
na jayate mriyate va kadachin nayam bhutva bhavita va na bhuyah ajo nityah shashvato'yam purano na hanyate hanyamane sharire
Translation
The soul is never born, nor does it ever die. It has not come into being, does not come into being, and will not come into being. It is unborn, eternal, ever-existing, and primeval. It is not slain when the body is slain.
Commentary
One of the most celebrated verses of the Gita. It declares the absolute immortality of the soul in the most comprehensive terms possible — unborn, undying, eternal, and beyond the cycle of creation and destruction.