In the body (BG)
Bhagavad-gita As It Is
BG Chapters 1 - 6
There is no endurance of the changing body. That the body is changing every moment by the actions and reactions of the different cells is admitted by modern medical science; and thus growth and old age are taking place in the body. But the spirit soul exists permanently, remaining the same despite all changes of the body and the mind. That is the difference between matter and spirit. By nature, the body is ever changing, and the soul is eternal. This conclusion is established by all classes of seers of the truth, both impersonalist and personalist. In the Viṣṇu Purāṇa (2.12.38) it is stated that Viṣṇu and His abodes all have self-illuminated spiritual existence (jyotīṁṣi viṣṇur bhuvanāni viṣṇuḥ). The words existent and nonexistent refer only to spirit and matter. That is the version of all seers of truth.