Bhagavad Gita Verse 2.13

जैसे जीवात्माकी इस देहमें बालकपन, जवानी और वृद्धावस्था होती है, वैसे ही अन्य शरीरकी प्राप्ति होती है; उस विषयमें धीर पुरुष मोहित नहीं होता|

Lord Krishna continued:Dear ARJUNA, the wise never get confused by the fact that the ATMA or Soul goes through the stages of childhood, youth and old age along with the body. When one body ceases to function, the soul passes on to another body. The cycle is then repeated once more.