Bhagavad Gita Chapter 2 Verse 27

jātasya hi dhruvo mṛtyurdhruvaṃ janma mṛtasya ca
tasmādaparihārye’rthe na tvaṃ śocitumarhasi

Indeed, certain is death for the born, and certain is birth for the dead; therefore, over the inevitable, you should not grieve.

jātasya = of one who has taken his birth; hi = certainly; dhruvaḥ = a fact; mṛtyuḥ = death; dhruvaṃ = it is also a fact; janma = birth; mṛtasya = of the dead; ca = also; tasmāt = therefore; aparihārye = of that which is unavoidable; arthe = in the matter; na = do not; tvaṃ = you; śocituṃ = to lament; arhasi = deserve.;