Bhagavad Gita 2.12

There was never a time when I was not, nor you, nor these princes were not; there will never be a time when we shall cease to exist.

न त्वेवाहं जातु नासं न त्वं नेमे जनाधिपाः।
न चैव न भविष्यामः सर्वे वयमतः परम्॥

na tvevāhaṃ jātu nāsaṃ na tvaṃ neme janādhipāḥ|
na caiva na bhaviṣyāmaḥ sarve vayamataḥ param||

English translation (above): Shri Purohit Swami (1935), public domain. Sanskrit text via github.com/gita/gita (Unlicense).