oṁ ityekākṣharaṁ brahma vyāharan mām anusmaran
yaḥ prayāti tyajan dehaṁ sa yāti paramāṁ gatim||13|| 

Meaning : Whoever, at the time of death, chants the one-syllabled “Om,” while remembering Me (Krishna), and leaves the body, that person attains the supreme goal.