Mbh 6.32.3a

“The Holy One said, ‘Brahman is the Supreme and indestructible. Adhyatma is said to be its own manifestation. The offering (to any godhead in a sacrifice) which causeth the production and development of all--this is called action.[213] Remembering me alone in (his) last moments, he that, casting off his body, departeth (hence), cometh into my essence. There is no doubt in this. Whichever form (of godhead) one remembereth when one casteth off, at the end, (his) body, unto that one he goeth, O son of Kunti, having habitually meditated on it always. Therefore, think of me at all times, and engage in battle. Fixing thy mind and understanding on me, thou wilt, without doubt, come even to me. Thinking (of the Supreme) with a mind not running to other objects and endued with abstraction in the form of uninterrupted application, one goeth, O son of Pritha, unto the Divine and Supreme male Being. He who at the time of his departure, with a steady mind, endued with reverence, with power of abstraction, and directing the life-breath called Prana between the eye-brows, thinketh of that ancient seer, who is the ruler (of all), who is minuter than the minutest atom, who is the ordainer of all, who is inconceivable in form, and who is beyond all darkness, cometh unto that Divine and Supreme Male Being. I will tell thee in brief about that seat which persons conversant with the Vedas declare to be indestructible, which is entered by ascetics freed from all longings, and in expectation of which (people) practise the vows of Brahmacharins. Casting off (this) body, he who departeth, stopping up all the doors, confining the mind within the heart, placing his own life-breath called Prana between the eye-brows, resting on continued meditation, uttering this one syllable Om which is Brahman, and thinking of me, attaineth to the highest goal.