Bhagavad Gita 2.20

न जायते म्रियते वा कदाचिन्नायं भूत्वा भविता वा न भूयः।अजो नित्यः शाश्वतोऽयं पुराणोन हन्यते हन्यमाने शरीरे ॥२.२०॥

na jāyate mriyate vā kadācinnāyaṃ bhūtvā bhavitā vā na bhūyaḥajo nityaḥ śāśvato’yaṃ purāṇona hanyate hanyamāne śarīre

It is not born, nor does it ever die; after having been, it again does not cease to be; unborn, eternal, changeless, and ancient, it is not killed when the body is killed.

गीता