Chandogya Upanishad 8.12.1

8.12.1

maghavan martyaṃ vā idaṃ śarīram āttaṃ mṛtyunā \
tad asyāmṛtasyāśarīrasyātmano 'dhiṣṭhānam \
ātto vai saśarīraḥ priyāpriyābhyām \
na vai saśarīrasya sataḥ priyāpriyayor apahatir asti \
aśarīraṃ vāva santaṃ na priyāpriye spṛśataḥ \\812.1\

'O Indra, mortal indeed is this body, held by death. But it is the support of this deathless, bodilessfootnote{Later the illustration of the bodiless air and the like will be given. They, though bodiless, are mortal but the Ātman is immortal and bodiless.} Ātman. Verily, the embodied self is held by pleasure and pain. Surely, there is no cessation of pleasure and pain for one who is embodied. But pleasure and pain do not indeed touch one who is bodiless.'