Bhagavad Gita Chapter 13.33
yathā sarva-gataḿ saukṣmyād
ākāśaḿ nopalipyate
sarvatrāvasthito dehe
tathātmā nopalipyate
Translation
The sky, due to its subtle nature, does not mix with anything, although it is all-pervading. Similarly, the soul situated in Brahman vision does not mix with the body, though situated in that body.