Bhagavad Gita: Chapter 2, Verse 20

न जायते म्रियते वा कदाचि-
न्नायं भूत्वा भविता वा न भूयः ।
अजो नित्यः शाश्वतोऽयं पुराणो
न हन्यते हन्यमाने शरीरे ॥ २-२० ॥

na jāyate mriyate vā kadācin
nāyaṁ bhūtvā bhavitā vā na bhūyaḥ
ajo nityaḥ śāśvato ’yaṁ purāṇo
na hanyate hanyamāne śarīre 2.20

Never is the Soul born, and never does it die, nor is it that has come to exist, it will again cease to be. This one is birthless, eternal, ever-existing and primeval. It is not killed when the body is killed.