Chapter 13 · The Field and the Knower · Krishna said
Bhagavad Gita 13.13 — The Supreme to be known
ज्ञेयं यत्तत्प्रवक्ष्यामि यज्ज्ञात्वामृतमश्नुते। अनादिमत्परं ब्रह्म न सत्तन्नासदुच्यते ॥
jñeyaṃ yattatpravakṣyāmi yajjñātvāmṛtamaśnute | anādi matparaṃ brahma na sattannāsaducyate ||
Meaning
I will now tell you what is to be known, knowing which one tastes immortality. It is the beginningless Supreme Brahman, which is said to be neither "being" nor "non-being".