Bhagavad-Gītā 2.26-27
"If, however, you think that the soul [or the symptoms of life] will always be born and die forever, you still have no reason to lament, O mighty-armed."
"One who has taken his birth is sure to die, and after death one is sure to take birth again. Therefore, in the unavoidable discharge of your duty, you should not lament."
https://vedy.online/en/bg/2/26/ & https://vedy.online/en/bg/2/27/