KAṬHA UPANISHAD · 1.2.18

न जायते म्रियते वा विपश्चिन्नायं कुतश्चिन्न बभूव कश्चित् ।
अजो नित्यः शाश्वतोऽयं पुराणो
न हन्यते हन्यमाने शरीरे ॥ १८॥

na jāyate mriyate vā vipaścinnāyaṃ kutaścinna babhūva kaścit ।
ajo nityaḥ śāśvato’yaṃ purāṇo
na hanyate hanyamāne śarīre ॥ 18॥

That Wise One is not born, neither does he die; he came not from anywhere, neither is he anyone; he is unborn, he is everlasting, he is ancient and sempiternal, he is not slain in the slaying of the body.