Bhagavad Gita
Chapter 2 · Verse 20
न जायते म्रियते वा कदाचिन्नायं भूत्वा भविता वा न भूयः। अजो नित्यः शाश्वतोऽयं पुराणो न हन्यते हन्यमाने शरीरे॥
na jāyate mriyate vā kadācin nāyaṁ bhūtvā bhavitā vā na bhūyaḥ, ajo nityaḥ śāśvato 'yaṁ purāṇo na hanyate hanyamāne śarīre
What you most fundamentally are is described here as untouched by birth and death, deeper and steadier than any single chapter of a life.
What is truly you was never born, and will never die.