What does Krishna mean when he says that the spirit leaves the mortal body and puts on another like a change of clothes?

When Krishna says that the spirit leaves the mortal body and puts on another like a change of clothes, he emphasizes the transient nature of physical existence. The soul, or atman, is eternal and undergoes cycles of birth, death, and rebirth, akin to changing garments. This metaphor illustrates the idea that physical death is not the end of the soul’s journey, but rather a transition to a new form of life, reinforcing the notion of the soul's immortality and the importance of detachment from the physical body.