Bhagavad Gita · 2.28
अव्यक्तादीनि भूतानि व्यक्तमध्यानि भारत।अव्यक्तनिधनान्येव तत्र का परिदेवना॥
avyaktādīni bhūtāni vyakta-madhyāni bhārata avyakta-nidhanāny eva tatra kā paridevanā
All beings are unmanifest before birth, manifest between birth and death, and unmanifest again after death. What is there to grieve about?
— Bhagavad Gita 2.28
Source: Sacred-Texts.com (Sanskrit) + Bhagavad-Gita.io (translations)