Bhagavad Gita 2.11

Lord Shri Krishna said: Why grieve for those for whom no grief is due, yet professing wisdom? The wise grieve neither for the dead nor the living.

श्री भगवानुवाच
अशोच्यानन्वशोचस्त्वं प्रज्ञावादांश्च भाषसे।
गतासूनगतासूंश्च नानुशोचन्ति पण्डिताः॥

śrī bhagavānuvāca
aśocyānanvaśocastvaṃ prajñāvādāṃśca bhāṣase|
gatāsūnagatāsūṃśca nānuśocanti paṇḍitāḥ||

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