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

na tvevāhaṁ jātu nāsaṁ na tvaṁ neme janādhipāḥ na chaiva na bhaviṣhyāmaḥ sarve vayamataḥ param

Nor at any time verily was I not, nor thou, nor these princes of men, nor verily shall we ever cease to be, hereafter.

In plain words: Krishna says that he, Arjuna and all these kings have always existed. None of them will ever stop existing in the future.