BG 8.3

The Lord said: The Supreme Indestructible Entity is called Brahman; one’s own self is called adhyatma. Actions pertaining to the material personality of living beings, and its development are called karma, or fruitive activities.

BG 8.11

Scholars of the Vedas describe Him as Imperishable; great ascetics practice the vow of celibacy and renounce worldly pleasures to enter into Him. I shall now explain to you briefly the path to that goal.

BG 11.18

I recognize You as the supreme imperishable being, the Ultimate Truth to be known by the scriptures. You are the support of all creation; You are the eternal protector of Sanātan Dharma (the Eternal Religion); and You are the everlasting Supreme Divine Personality.

BG 11.37

O Great One, who are even greater than Brahma, the original creator, why should they not bow to you? O Limitless One, O Lord of the devatās, O Refuge of the universe, You are the imperishable reality beyond both the manifest and the non-manifest.

BG 12.1

Arjun inquired: Between those who are steadfastly devoted to Your personal form and those who worship the formless Brahman, whom do You consider to be more perfect in Yog?

BG 12.3-4

But those who worship the formless aspect of the Absolute Truth—the imperishable, the indefinable, the unmanifest, the all-pervading, the unthinkable, the unchanging, the eternal, and the immoveable—by restraining their senses and being even-minded everywhere, such persons, engaged in the welfare of all beings, also attain Me.