Chapter 8 · The Imperishable Absolute · Krishna said
Bhagavad Gita 8.13 — Chanting Om
ओमित्येकाक्षरं ब्रह्म व्याहरन्मामनुस्मरन्। यः प्रयाति त्यजन्देहं स याति परमां गतिम् ॥
omityekākṣaraṃ brahma vyāharanmāmanusmaran | yaḥ prayāti tyajandehaṃ sa yāti paramāṃ gatim ||
Meaning
— one who departs leaving the body while chanting the single syllable Om, which is Brahman, and remembering me, reaches the supreme goal.