The Bhagavad Gita Chapter II Verse 13
“tatah sankhas ca bheryas ca panavanakagomukhah sahasaivabhyahanyanta sa sabdas tumulo ‘bhavat” “As is the body, the embodied Self passes through childhood, youth, and old age, so is its passage into another body; the wise thereat are not disturbed.” In this verse Krishna is responding to Arjuna’s plea for assistance