Bhagavad Gita 2.20

न जायते म्रियते वा कदाचित्-
नायं भूत्वा भविता वा न भूय: ।

अजो नित्य: शाश्वतोऽयं पुराणो
न हन्यते हन्यमाने शरीरे  ॥

na jāyate mriyate vā kadācit-
nāyaṃ bhūtvā bhavitā vā na bhūya:

ajo nitya: śāśvato’yaṃ purāṇo
na hanyate hanyamāne śarīre – 2.20

The Soul is not born, nor does It ever die. After having been present, It will not cease to be either. Unborn, ever present, permanent, most ancient, It is not killed when the body is killed.