Bhagavad Gita 2.26

अथ चैनं नित्यजातं नित्यं वा मन्यसे मृतम् |
तथापि त्वं महाबाहो नैव शोचितुमर्हसि

Translation

If, however, you think that the self is subject to constant birth and death, O mighty-armed Arjun, even then you should not grieve like this.